| Accepted Latin Names | Common Name | In Kent? | Type | Kent ref. | Status | Authority | Record No. |
|---|---|---|---|---|---|---|---|
| Sagina apetala | Annual Pearlwort | Page 77 | A1 | 46--10--7 | N | Ard. | 0920002559 |
| Sagina apetala subsp. apetala | Yes | A1 | 46--10--7--a | N | 0920001762 | ||
| Sagina apetala subsp. erecta | Yes | A1 | 46--10--7--b | N | F. Herm. | 0920001761 | |
| Sagina maritima | Sea Pearlwort | Yes | A1 | 46--10--8 | N | Don | 0920001765 |
| Sagina nivalis | Snow Pearlwort | Yes | A1 | 46--10--2 | N | (Lindblom) Fr. | 0920001764 |
| Sagina nodosa | Knotted Pearlwort | Page 77 | A1 | 46--10--1 | N | (L.) Fenzl | 0920001766 |
| Sagina procumbens | Procumbent Pearlwort | Page 77 | A1 | 46--10--5 | N | L. | 0920001767 |
| Sagina saginoides | Alpine Pearlwort | Yes | A1 | 46--10--4 | N | (L.) H. Karst. | 0920001768 |
| Sagina saginoides x procumbens = S. x normaniana | Scottish Pearlwort | Yes | A1 | 46--10--4 x 5 | Lagerh. | 0920002923 | |
| Sagina subulata | Heath Pearlwort | Page 77 | A1 | 46--10--3 | N | (Sw.) C. Presl | 0920001769 |
| Sagina subulata x procumbens = S. x micrantha | Yes | A1 | 46--10--3 x 5 | Boreau ex E. Martin | 0920002695 | ||
| Sagittaria graminea | Grass-leaved Arrowhead | Clement | A3 | 137--1--gra | Michx. | 0920005460 | |
| Sagittaria latifolia | Duck-potato | Yes | A1 | 137--1--2 | Ne | Willd. | 0920004500 |
| Sagittaria rigida | Canadian Arrowhead | Yes | A1 | 137--1--3 | Ne | Pursh | 0920001770 |
| Sagittaria sagittifolia | Arrowhead | Page 79 | A1 | 137--1--1 | N | L. | 0920001771 |
| Sagittaria subulata | Narrow-leaved Arrowhead | Yes | A1 | 137--1--4 | Ne | (L.) Buchenau | 0920004499 |
| Salicornia dolichostachya | Long-spiked Glasswort | Yes | A1 | 43--6--7 | N | Moss | 0920001774 |
| Salicornia europaea | Common Glasswort | Page 79 | A1 | 43--6--3 | N | L. | 0920001775 |
| Salicornia europaea agg. | Aggregate | AK | 43--6--- | ||||
| Salicornia fragilis | Yellow Glasswort | Yes | A1 | 43--6--6 | N | P.W. Ball & Tutin | 0920001776 |
| Salicornia nitens | Shiny Glasswort | Yes | A1 | 43--6--5 | N | P.W. Ball & Tutin | 0920001778 |
| Salicornia obscura | Glaucous Glasswort | Yes | A1 | 43--6--4 | N | P.W. Ball & Tutin | 0920001779 |
| Salicornia procumbens agg. | Clement | AK | 43--6--- | ||||
| Salicornia pusilla | One-flowered Glasswort | Yes | A1 | 43--6--1 | N | Woods | 0920001780 |
| Salicornia pusilla x ramosissima | Yes | A1 | 43--6--1 x 2 | 0920002698 | |||
| Salicornia ramosissima | Purple Glasswort | Page 79 | A1 | 43--6--2 | N | Woods | 0920001781 |
| Salix acutifolia | Siberian Violet-willow | Yes | A1 | 61--2--7 | Ne | Willd. | 0920007552 |
| Salix alba | White Willow | Page 79 | A1 | 61--2--3 | Ar | L. | 0920001784 |
| Salix alba x babylonica = S. x sepulcralis | Weeping Willow | Yes | A1 | 61--2--3 x bab | Ne | Simonk. | 0920002350 |
| Salix arbuscula | Mountain Willow | Yes | A1 | 61--2--19 | N | L. | 0920001785 |
| Salix arbuscula x herbacea = S. x simulatrix | Yes | A1 | 61--2--19 x 21 | F.B. White | 0920002353 | ||
| Salix arbuscula x reticulata = S. x ganderi | Yes | A1 | 61--2--19 x 22 | Huter ex Zahn | 0920002321 | ||
| Salix aurita | Eared Willow | Page 79 | A1 | 61--2--12 | N | L. | 0920001787 |
| Salix aurita x herbacea = S. x margarita | Yes | A1 | 61--2--12 x 21 | F.B. White | 0920002332 | ||
| Salix aurita x lapponum = S. x obtusifolia | Yes | A1 | 61--2--12 x 17 | Willd. | 0920002337 | ||
| Salix aurita x lapponum x herbacea | Yes | A1 | 61--2--12 x 17 x 21 | 0920002308 | |||
| Salix aurita x myrsinifolia = S. x coriacea | Yes | A1 | 61--2--12 x 14 | J. Forbes | 0920002312 | ||
| Salix aurita x myrsinifolia x phylicifolia = S. x saxetana | Yes | A1 | 61--2--12 x 14 x 15 | F.B. White | 0920002346 | ||
| Salix aurita x phylicifolia = S. x ludificans | Yes | A1 | 61--2--12 x 15 | F.B. White | 0920002331 | ||
| Salix aurita x repens = S. x ambigua | Yes | A1 | 61--2--12 x 16 | N | Ehrh. | 0920002304 | |
| Salix aurita x repens x herbacea = S. x grahamii | Yes | A1 | 61--2--12 x 16 x 21 | Borrer ex Baker | 0920002323 | ||
| Salix babylonica | Clement | A3 | 61--2--bab | L. | 0920002380 | ||
| Salix candida | Clement | A3 | 61--2--can | Flgg‚ | 0920008685 | ||
| Salix caprea | Goat Willow | Page 79 | A1 | 61--2--10 | N | L. | 0920001788 |
| Salix caprea subsp. caprea | Yes | A1 | 61--2--10--a | 0920001788.1 | |||
| Salix caprea subsp. sphacelata | Yes | A1 | 61--2--10--b | N | (Sm.) Macreight | 0920001788.2 | |
| Salix caprea x aurita = S. x capreola | Yes | A1 | 61--2--10 x 12 | N | Jos. Kern. ex Andersson | 0920002309 | |
| Salix caprea x cinerea = S. x reichardtii | Yes | A1 | 61--2--10 x 11 | N | A. Kern. | 0920002342 | |
| Salix caprea x cinerea x repens | Yes S3 | A1 | 61--2--10 x 11 x 16 | N | |||
| Salix caprea x elaeagnos = S. x seringeana | Clement | A3 | 61--2--10 x ela | Gaudin | 0920008692 | ||
| Salix caprea x lapponum = S. x canescens | Yes S3 | A1 | 61--2--10 x 17 | Willd. | 0920002324 | ||
| Salix caprea x myrsinifolia = S. x latifolia | Yes S3 | A1 | 61--2--10 x 14 | J. Forbes | 0920002326 | ||
| Salix caprea x myrsinifolia x phylicifolia | Yes S3 | A1 | 61--2--10 x 14 x 15 | ||||
| Salix caprea x phylicifolia | Yes | A1 | 61--2--10 x 15 | 0920002366 | |||
| Salix caprea x repens = S. x laschiana | Yes | A1 | 61--2--10 x 16 | Zahn | 0920002325 | ||
| Salix cinerea | Page 79 | A1 | 61--2--11 | N | L. | 0920001789 | |
| Salix cinerea subsp. cinerea | Grey Willow | Yes | A1 | 61--2--11--a | N | 0920001790 | |
| Salix cinerea subsp. oleifolia | Rusty Willow | Yes | A1 | 61--2--11--b | N | Macreight | 0920001786 |
| Salix cinerea x aurita = S. x multinervis | Yes | A1 | 61--2--11 x 12 | N | D”ll | 0920002335 | |
| Salix cinerea x aurita x myrsinifolia = S. x forbesiana | Yes | A1 | 61--2--11 x 12 x 14 | Druce | 0920002317 | ||
| Salix cinerea x myrsinifolia = S. x strepida | Yes | A1 | 61--2--11 x 14 | Schleich. ex J. Forbes | 0920002360 | ||
| Salix cinerea x myrsinifolia x phylicifolia | Yes S3 | A1 | 61--2--11 x 14 x 15 | ||||
| Salix cinerea x phylicifolia = S. x laurina | Laurel-leaved Willow | Yes | A1 | 61--2--11 x 15 | N | Sm. | 0920002327 |
| Salix cinerea x repens = S. x subsericea | Yes | A1 | 61--2--11 x 16 | D”ll | 0920002361 | ||
| Salix daphnoides | European Violet-willow | Yes | A1 | 61--2--6 | Ne | Vill. | 0920001791 |
| Salix discolor | Glaucous Willow | Clement | A3 | 61--2--dis | Muhl. | 0920008686 | |
| Salix elaeagnos | Olive Willow | Yes S1 | A1 | 61--2--ela | Ne | Scop. | 0920004382 |
| Salix eriocephala | Heart-leaved Willow | Yes | A1 | 61--2--13 | Ne | Michx. | 0920007553 |
| Salix fragilis | Crack-willow | Page 79 | A1 | 61--2--2 | Ar | L. | 0920001793 |
| Salix fragilis x alba = S. x rubens | Hybrid Crack-willow | Yes | A1 | 61--2--2 x 3 | Ar | Schrank | 0920002343 |
| Salix fragilis x babylonica = S. x pendulina | Weeping Crack-willow | Yes | A1 | 61--2--2 x bab | Ne | Wender. | 0920002307 |
| Salix fragilis x triandra = S. x alopecuroides | Yes | A1 | 61--2--2 x 4 | Tausch ex Opiz | 0920002357 | ||
| Salix herbacea | Dwarf Willow | Page 79 | A1 | 61--2--21 | N | L. | 0920001794 |
| Salix hookeriana | Clement | A3 | 61--2--hoo | Barratt | 0920008687 | ||
| Salix irrorata | Blue-stem Willow | Clement | A3 | 61--2--irr | Andersson | 0920004100 | |
| Salix lanata | Woolly Willow | Yes | A1 | 61--2--18 | N | L. | 0920001795 |
| Salix lanata x herbacea = S. x sadleri | Yes | A1 | 61--2--18 x 21 | Syme | 0920002345 | ||
| Salix lapponum | Downy Willow | Yes | A1 | 61--2--17 | N | L. | 0920001796 |
| Salix lapponum x arbuscula = S. x pseudoglauca | Yes S3 | A1 | 61--2--17 x 19 | Andersson | 0920002340 | ||
| Salix lapponum x herbacea = S. x sobrina | Yes | A1 | 61--2--17 x 21 | F.B. White | 0920002355 | ||
| Salix lapponum x lanata | Yes S2 | A1 | 61--2--17 x 18 | 0920003813 | |||
| Salix lucida | Shining Willow | Clement | A3 | 61--2--luc | Muhl. | 0920008688 | |
| Salix microstachya | Clement | A3 | 61--2--mic | Turcz. ex Trautv. | 0920008689 | ||
| Salix myrsinifolia | Dark-leaved Willow | Yes | A1 | 61--2--14 | N | Salisb. | 0920001797 |
| Salix myrsinifolia x arbuscula | Yes S2 | A1 | 61--2--14 x 19 | ||||
| Salix myrsinifolia x lapponum | Yes S1 | A1 | 61--2--14 x 17 | 0920003557 | |||
| Salix myrsinifolia x myrsinites = S. x punctata | Yes | A1 | 61--2--14 x 20 | Wahlenb. | 0920002341 | ||
| Salix myrsinifolia x phylicifolia = S. x tetrapla | Yes | A1 | 61--2--14 x 15 | N | Walker | 0920002363 | |
| Salix myrsinifolia x phylicifolia x myrsinites = S. x blyttiana | Yes S3 | A1 | 61--2--14 x 15 x 20 | Andersson | 0920002367 | ||
| Salix myrsinifolia x phylicifolia x repens | Yes S1 | A1 | 61--2--14 x 15 x 16 | 0920003559 | |||
| Salix myrsinifolia x repens = S. x felina | Yes | A1 | 61--2--14 x 16 | Buser ex E.G. Camus & A. Camus | 0920002316 | ||
| Salix myrsinites | Whortle-leaved Willow | Yes | A1 | 61--2--20 | N | L. | 0920001798 |
| Salix myrsinites x herbacea | Yes S1 | A1 | 61--2--20 x 21 | 0920003555 | |||
| Salix pentandra | Bay Willow | Page 79 | A1 | 61--2--1 | N | L. | 0920001799 |
| Salix pentandra x alba = S. x ehrhartiana | Ehrhart's Willow | Yes | A1 | 61--2--1 x 3 | Ne | Sm. | 0920002315 |
| Salix pentandra x fragilis = S. x meyeriana | Shiny-leaved Willow | Yes | A1 | 61--2--1 x 2 | ? | Rostk. ex Willd. | 0920002333 |
| Salix petiolaris | Slender Willow | Clement | A3 | 61--2--pet | Sm. | 0920008690 | |
| Salix phylicifolia | Tea-leaved Willow | Yes | A1 | 61--2--15 | N | L. | 0920001800 |
| Salix phylicifolia x repens | Yes | A1 | 61--2--15 x 16 | 0920002347 | |||
| Salix purpurea | Purple Willow | Page 79 | A1 | 61--2--5 | N | L. | 0920001801 |
| Salix purpurea x aurita = S. x dichroa | Yes | A1 | 61--2--5 x 12 | D”ll | 0920002313 | ||
| Salix purpurea x aurita x phylicifolia = S. x sesquitertia | Yes | A1 | 61--2--5 x 12 x 15 | F.B. White | 0920002352 | ||
| Salix purpurea x cinerea = S. x pontederiana | Yes | A1 | 61--2--5 x 11 | Willd. | 0920002356 | ||
| Salix purpurea x cinerea x aurita = S. x confinis | Yes | A1 | 61--2--5 x 11 x 12 | E.G. Camus & A. Camus | 0920002311 | ||
| Salix purpurea x myrsinifolia = S. x beckiana | Yes | A1 | 61--2--5 x 14 | Beck | 0920002306 | ||
| Salix purpurea x phylicifolia = S. x secerneta | Yes | A1 | 61--2--5 x 15 | F.B. White | 0920002348 | ||
| Salix purpurea x repens = S. x doniana | Yes | A1 | 61--2--5 x 16 | G. Anderson ex Sm. | 0920002314 | ||
| Salix purpurea x viminalis = S. x rubra | Green-leaved Willow | Yes | A1 | 61--2--5 x 9 | ? | Huds. | 0920002344 |
| Salix purpurea x viminalis x caprea x cinerea = S. x taylorii | Yes | A1 | 61--2--5 x 9 x 10 x 11 | Rech. f. | 0920002362 | ||
| Salix purpurea x viminalis x cinerea = S. x forbyana | Fine Osier | Yes | A1 | 61--2--5 x 9 x 11 | ? | Sm. | 0920002318 |
| Salix repens | Creeping Willow | Page 79 | A1 | 61--2--16 | N | L. | 0920001802 |
| Salix repens x arbuscula | Yes S1 | A1 | 61--2--16 x 19 | 0920003548 | |||
| Salix repens x herbacea = S. x cernua | Yes | A1 | 61--2--16 x 21 | E.F. Linton | 0920002310 | ||
| Salix repens x lapponum | Yes S3 | A1 | 61--2--16 x 17 | 0920002339 | |||
| Salix reticulata | Net-leaved Willow | Yes | A1 | 61--2--22 | N | L. | 0920001803 |
| Salix schraderiana | Clement | A3 | 61--2--sch | Willd. | 0920008691 | ||
| Salix triandra | Almond Willow | Page 79 | A1 | 61--2--4 | Ar | L. | 0920001804 |
| Salix triandra x purpurea | Yes | A1 | 61--2--4 x 5 | 0920002328 | |||
| Salix triandra x viminalis = S. x mollissima | Sharp-stipuled Willow | Yes | A1 | 61--2--4 x 9 | Ar | Hoffm. ex Elwert | 0920002334 |
| Salix udensis | Sachalin Willow | Yes | A1 | 61--2--8 | Ne | Trautv. & C.A. Mey. | 0920007554 |
| Salix viminalis | Osier | Page 79 | A1 | 61--2--9 | Ar | L. | 0920001805 |
| Salix viminalis x aurita = S. x fruticosa | Shrubby Osier | Yes | A1 | 61--2--9 x 12 | ? | D”ll | 0920002320 |
| Salix viminalis x caprea = S. x smithiana | Broad-leaved Osier | Yes S3 | A1 | 61--2--9 x 10 | ? | Willd. | 0920002351 |
| Salix viminalis x caprea x aurita = S. x stipularis | Eared Osier | Yes | A1 | 61--2--9 x 10 x 12 | ? | Sm. | 0920002358 |
| Salix viminalis x caprea x cinerea = S. x calodendron | Holme Willow | Yes | A1 | 61--2--9 x 10 x 11 | Ne | Wimm. | 0920001792 |
| Salix viminalis x cinerea = S. x holosericea | Silky-leaved Osier | Yes S3 | A1 | 61--2--9 x 11 | ? | Willd. | 0920002354 |
| Salix viminalis x cinerea x aurita = S. x hirtei | Stace | A2 | 61--2--9 x 11 x 12 | Str„hler | 0920003814 | ||
| Salix viminalis x cinerea x repens = S. x angusensis | Yes | A1 | 61--2--9 x 11 x 16 | Rech. f. | 0920002305 | ||
| Salix viminalis x myrsinifolia = S. x seminigricans | Yes | A1 | 61--2--9 x 14 | E.G. Camus & A. Camus | 0920007555 | ||
| Salix viminalis x repens = S. x friesiana | Yes | A1 | 61--2--9 x 16 | Andersson | 0920002319 | ||
| Salpichroa origanifolia | Cock's-eggs | Yes | A1 | 110--5--1 | Ne | (Lam.) Thell. | 0920007556 |
| Salpiglossis sinuata | Painted-tongue | Clement | A3 | 110--SAL--sin | Ruiz & Pav. | 0920008693 | |
| Salsola collina | Clement | A3 | 43--8--col | Pall. | 0920008694 | ||
| Salsola kali | Page 79 | A1 | 43--8--1 | L. | 0920005441 | ||
| Salsola kali subsp. iberica | Spineless Saltwort | Yes | A1 | 43--8--1--b | Ne | (Sennen & Pau) Rilke | 0920001807 |
| Salsola kali subsp. kali | Prickly Saltwort | Yes | A1 | 43--8--1--a | N | 0920001806 | |
| Salsola kali subsp. tragus | Clement | A3 | 43--8--1--c | (L.) Nyman | 0920001808 | ||
| Salsola soda | Clement | A3 | 43--8--sod | L. | 0920008695 | ||
| Salvia aethiopis | African Sage | Clement | A3 | 118--25--aet | L. | 0920004237 | |
| Salvia argentea | Silver Sage | Clement | A3 | 118--25--arg | L. | 0920008696 | |
| Salvia barrelieri | Clement | A3 | 118--25--bar | Etl. | 0920008697 | ||
| Salvia bornmuelleri | Clement | A3 | 118--25--bor | Hausskn. | 0920008698 | ||
| Salvia glutinosa | Sticky Clary | Yes | A1 | 118--25--2 | Ne | L. | 0920007557 |
| Salvia nemorosa | Balkan Clary | Clement | A3 | 118--25--nem | L. | 0920001811 | |
| Salvia officinalis | Sage | Clement | A3 | 118--25--off | L. | 0920008201 | |
| Salvia pratensis | Meadow Clary | Yes | A1 | 118--25--3 | ?N | L. | 0920001810 |
| Salvia pratensis x nemorosa = S. x sylvestris | Hybrid Clary | Yes S2 | A1 | 118--25--3 x nem | L. | ||
| Salvia reflexa | Mintweed | Stace | A2 | 118--25--ref | Ca | Hornem. | 0920008202 |
| Salvia sclarea | Clary | Yes | A1 | 118--25--1 | Ne | L. | 0920007558 |
| Salvia splendens | Scarlet Sage | Clement | A3 | 118--25--spl | Ker Gawl. | 0920008203 | |
| Salvia verbenaca | Wild Clary | Page 79 | A1 | 118--25--4 | N | L. | 0920001812 |
| Salvia verticillata | Whorled Clary | Yes | A1 | 118--25--6 | Ne | L. | 0920001813 |
| Salvia villicaulis | Clement | A3 | 118--25--vil | Borb s | 0920005681 | ||
| Salvia virgata | Clement | A3 | 118--25--vir | Jacq. | 0920005692 | ||
| Salvia viridis | Annual Clary | Yes | A1 | 118--25--5 | N | L. | 0920007559 |
| Salvia x andrzejowskii | Clement | A3 | 118--25--and | Blocki | 0920008699 | ||
| Sambucus canadensis | American Elder | Yes | A1 | 131--1--3 | Ne | L. | 0920007560 |
| Sambucus ebulus | Dwarf Elder | Page 79 | A1 | 131--1--4 | Ar | L. | 0920001814 |
| Sambucus nigra | Elder | Page 79 | A1 | 131--1--2 | N | L. | 0920001815 |
| Sambucus racemosa | Red-berried Elder | Page 79 | A1 | 131--1--1 | Ne | L. | 0920001816 |
| Samolus valerandi | Brookweed | Page 79 | A1 | 69--8--1 | N | L. | 0920001817 |
| Sanguisorba canadensis | White Burnet | Yes | A1 | 75--17--2 | Ne | L. | 0920007561 |
| Sanguisorba minor | Page 81 | A1 | 75--17--3 | Scop. | 0920005442 | ||
| Sanguisorba minor subsp. magnolii | Clement | A3 | 75--17--3--c | (Spach) Briq. | 0920008700 | ||
| Sanguisorba minor subsp. minor | Salad Burnet | Yes | A1 | 75--17--3--a | N | 0920001599 | |
| Sanguisorba minor subsp. muricata | Fodder Burnet | Yes | A1 | 75--17--3--b | Ne | (Gremli) Briq. | 0920001598 |
| Sanguisorba officinalis | Great Burnet | Page 81 | A1 | 75--17--1 | N | L. | 0920001818 |
| Sanicula europaea | Sanicle | Page 81 | A1 | 107--2--1 | N | L. | 0920001819 |
| Santolina chamaecyparissus | Lavender-cotton | Yes | A1 | 135--51--1 | Ne | L. | 0920001820 |
| Santolina rosmarinifolia | Holy-flax | Clement | A3 | 135--51--ros | L. | 0920008701 | |
| Sanvitalia procumbens | Clement | A3 | 135--SAN--pro | Lam. | 0920008204 | ||
| Saponaria calabrica | Clement | A3 | 46--22--cal | Guss. | 0920005656 | ||
| Saponaria glutinosa | Clement | A3 | 46--22--glu | M. Bieb. | 0920008702 | ||
| Saponaria ocymoides | Rock Soapwort | Yes | A1 | 46--22--2 | Ne | L. | 0920005410 |
| Saponaria officinalis | Soapwort | Page 81 | A1 | 46--22--1 | Ar | L. | 0920001821 |
| Saponaria orientalis | Clement | A3 | 46--22--ori | L. | 0920008703 | ||
| Sarcococca confusa | Clement | A3 | 90--SAR--con | Sealy | 0920008704 | ||
| Sarcococca hookeriana | Clement | A3 | 90--SAR--hoo | Baill. | 0920008705 | ||
| Sarcocornia perennis | Perennial Glasswort | Yes | A1 | 43--5--1 | N | (Mill.) A.J. Scott | 0920001777 |
| Sarracenia flava | Trumpets | Clement | A3 | 54--1--fla | L. | 0920008205 | |
| Sarracenia leucophylla | Purple Trumpet-leaf | Clement | A3 | 54--1--leu | Raf. | 0920008706 | |
| Sarracenia purpurea | Pitcherplant | Yes | A1 | 54--1--1 | Ne | L. | 0920001823 |
| Sasa palmata | Broad-leaved Bamboo | Yes | A1 | 153--3--1 | Ne | (Burb.) E.G. Camus | 0920004308 |
| Sasa veitchii | Veitch's Bamboo | Yes | A1 | 153--3--2 | Ne | (CarriŠre) Rehder | 0920004309 |
| Sasaella ramosa | Hairy Bamboo | Yes | A1 | 153--4--1 | Ne | (Makino) Makino | 0920004310 |
| Satureja hortensis | Summer Savory | Clement | A3 | 118--17--hor | L. | 0920004107 | |
| Satureja montana | Winter Savory | Yes | A1 | 118--17--1 | Ne | L. | 0920001824 |
| Saussurea alpina | Alpine Saw-wort | Page 81 | A1 | 135--4--1 | N | (L.) DC. | 0920001825 |
| Saussurea discolor | Heart-leaved Saussurea | Clement | A3 | 135--4--dis | (Willd.) DC. | 0920008707 | |
| Saxifraga aizoides | Yellow Saxifrage | Page 81 | A1 | 74--5--12 | N | L. | 0920001826 |
| Saxifraga cernua | Drooping Saxifrage | Yes | A1 | 74--5--14 | N | L. | 0920001827 |
| Saxifraga cespitosa | Tufted Saxifrage | Yes | A1 | 74--5--18 | N | L. | 0920001828 |
| Saxifraga cuneifolia | Lesser Londonpride | Yes | A1 | 74--5--7 | Ne | L. | 0920007562 |
| Saxifraga cymbalaria | Celandine Saxifrage | Yes | A1 | 74--5--2 | Ne | L. | 0920001829 |
| Saxifraga granulata | Meadow Saxifrage | Page 81 | A1 | 74--5--15 | N | L. | 0920001830 |
| Saxifraga hirculus | Marsh Saxifrage | Yes | A1 | 74--5--1 | N | L. | 0920001832 |
| Saxifraga hirsuta | Kidney Saxifrage | Yes | A1 | 74--5--10 | N | L. | 0920001833 |
| Saxifraga hypnoides | Mossy Saxifrage | Page 81 | A1 | 74--5--16 | N | L. | 0920001835 |
| Saxifraga hypnoides x rosacea | Yes | A1 | 74--5--16 x 17 | 0920002704 | |||
| Saxifraga hypnoides x tridactylites | Yes | A1 | 74--5--16 x 19 | 0920007563 | |||
| Saxifraga nivalis | Alpine Saxifrage | Yes | A1 | 74--5--3 | N | L. | 0920001836 |
| Saxifraga oppositifolia | Purple Saxifrage | Page 81 | A1 | 74--5--11 | N | L. | 0920001837 |
| Saxifraga paniculata | Livelong Saxifrage | Yes S1 | A1 | 74--5--pan | Ne | Mill. | 0920003561 |
| Saxifraga rivularis | Highland Saxifrage | Yes | A1 | 74--5--13 | N | L. | 0920001838 |
| Saxifraga rosacea | Irish Saxifrage | Yes | A1 | 74--5--17 | Moench | 0920005482 | |
| Saxifraga rosacea subsp. hartii | Yes | A1 | 74--5--17--b | N | (D.A. Webb) D.A. Webb | 0920001831 | |
| Saxifraga rosacea subsp. rosacea | Yes | A1 | 74--5--17--a | N | 0920001839 | ||
| Saxifraga rotundifolia | Round-leaved Saxifrage | Yes | A1 | 74--5--6 | Ne | L. | 0920007564 |
| Saxifraga spathularis | St Patrick's-cabbage | Yes | A1 | 74--5--9 | N | Brot. | 0920001840 |
| Saxifraga spathularis x hirsuta = S. x polita | False Londonpride | Yes | A1 | 74--5--9 x 10 | Ne | (Haw.) Link | 0920001834 |
| Saxifraga stellaris | Starry Saxifrage | Page 81 | A1 | 74--5--4 | N | L. | 0920001842 |
| Saxifraga stolonifera | Strawberry Saxifrage | Yes | A1 | 74--5--5 | Ne | Curtis | 0920007565 |
| Saxifraga tridactylites | Rue-leaved Saxifrage | Page 81 | A1 | 74--5--19 | N | L. | 0920001843 |
| Saxifraga trifurcata | Clement | A3 | 74--5--tri | Schrad. | 0920008708 | ||
| Saxifraga umbrosa | Pyrenean Saxifrage | Yes | A1 | 74--5--8 | Ne | L. | 0920001844 |
| Saxifraga umbrosa x hirsuta = S. x geum | Scarce Londonpride | Yes | A1 | 74--5--8 x 10 | Ne | L. | 0920004324 |
| Saxifraga umbrosa x spathularis = S. x urbium | Londonpride | Yes | A1 | 74--5--8 x 9 | Ne | D.A. Webb | 0920001841 |
| Saxifraga x arendsii | Clement | A3 | 74--5--are | Engl. | 0920004174 | ||
| Saxifraga x geum x paniculata = S. x andrewsii | Clement | A3 | 74--5--8 x 10 x pan | Harv. | 0920008709 | ||
| Scabiosa atropurpurea | Sweet Scabious | Yes | A1 | 134--5--2 | Ne | L. | 0920001845 |
| Scabiosa canescens | Clement | A3 | 134--5--can | Waldst. & Kit. | 0920008710 | ||
| Scabiosa caucasica | Pincushion-flower | Clement | A3 | 134--5--cau | M. Bieb. | 0920004111 | |
| Scabiosa columbaria | Small Scabious | Page 81 | A1 | 134--5--1 | N | L. | 0920001846 |
| Scabiosa ochroleuca | Clement | A3 | 134--5--och | L. | 0920008711 | ||
| Scabiosa prolifera | Clement | A3 | 134--5--pro | L. | 0920008712 | ||
| Scabiosa tricuspidata | Clement | A3 | 134--5--tri | hort., nom. nud. | 0920008713 | ||
| Scandix australis | Clement | A3 | 107--7--aus | L. | 0920004096 | ||
| Scandix iberica | Clement | A3 | 107--7--ibe | M. Bieb. | 0920008714 | ||
| Scandix pecten-veneris | Shepherd's-needle | Yes | A1 | 107--7--1 | Ar | L. | 0920001847 |
| Scandix stellata | Clement | A3 | 107--7--ste | Banks & Sol. | 0920008715 | ||
| Schedonnardus paniculatus | Clement | A3 | 153--SCE--pan | (Nutt.) Trel. | 0920008716 | ||
| Scheuchzeria palustris | Rannoch-rush | Yes | A1 | 140--1--1 | N | L. | 0920001848 |
| Schismus arabicus | Clement | A3 | 153--SCH--ara | Nees | 0920008717 | ||
| Schismus barbatus | Kelch-grass | Stace | A2 | 153--SCH--bar | Ca | (L.) Thell. | 0920003150 |
| Schizanthus grahamii x pinnatus = S. x wisetonensis | Clement | A3 | 110--SCH--pin x gra | hort., nom. nud. | 0920008719 | ||
| Schizanthus pinnatus | Poor-man's-orchid | Clement | A3 | 110--SCH--pin | Ruiz & Pav. | 0920008718 | |
| Schizostylis coccinea | Kaffir Lily | Yes S3 | A1 | 159--SCH--coc | Backh. & Harv. ex Hook. f. | 0920004131 | |
| Schkuhria pinnata | Dwarf Marigold | Stace | A2 | 135--SCH--pin | Ca | (Lam.) Kuntze | 0920008206 |
| Schmidtia kalihariensis | Clement | A3 | 153--SCI--kal | Stent | 0920008720 | ||
| Schoenoplectus lacustris | Common Club-rush | Page 81 | A1 | 152--7--1 | N | (L.) Palla | 0920001851 |
| Schoenoplectus lacustris x triqueter = S. x carinatus | Yes | A1 | 152--7--1 x 3 | (Sm.) Palla | 0920001850 | ||
| Schoenoplectus pungens | Sharp Club-rush | Yes | A1 | 152--7--4 | ?N | (Vahl) Palla | 0920001849 |
| Schoenoplectus tabernaemontani | Grey Club-rush | Page 81 | A1 | 152--7--2 | N | (C.C. Gmel.) Palla | |
| Schoenoplectus tabernaemontani x triqueter = S. x kuekenthalianus | Yes | A1 | 152--7--2 x 3 | (Junge) D.H. Kent | |||
| Schoenoplectus triqueter | Triangular Club-rush | Yes | A1 | 152--7--3 | N | (L.) Palla | 0920001853 |
| Schoenus ferrugineus | Brown Bog-rush | Yes | A1 | 152--12--2 | N | L. | 0920001854 |
| Schoenus nigricans | Black Bog-rush | Page 81 | A1 | 152--12--1 | N | L. | 0920001855 |
| Sciadopitys verticullata | Umbrella-pine | Clement | A3 | 20A--SCI--ver | (Thunb.) Siebold & Zucc. | 0920008721 | |
| Scilla autumnalis | Autumn Squill | Page 81 | A1 | 158--19--7 | N | L. | 0920001856 |
| Scilla bifolia | Alpine Squill | Yes | A1 | 158--19--1 | Ne | L. | 0920007566 |
| Scilla bithynica | Turkish Squill | Yes S1 | A1 | 158--19--bit | Ne | Boiss. | 0920003562 |
| Scilla liliohyacinthus | Pyrenean Squill | Yes | A1 | 158--19--5 | Ne | L. | 0920004413 |
| Scilla messeniaca | Greek Squill | Yes | A1 | 158--19--2 | Ne | Boiss. | 0920007567 |
| Scilla peruviana | Portuguese Squill | Yes | A1 | 158--19--6 | Ne | L. | 0920007568 |
| Scilla puschkinioides | Russian Squill | Clement | A3 | 158--19--pus | Regel | 0920008722 | |
| Scilla siberica | Siberian Squill | Yes | A1 | 158--19--3 | Ne | Haw. | 0920007569 |
| Scilla verna | Spring Squill | Page 81 | A1 | 158--19--4 | N | Huds. | 0920001857 |
| Scirpoides holoschoenus | Round-headed Club-rush | Yes | A1 | 152--6--1 | N | (L.) Soj k | 0920000985 |
| Scirpus inundatus | Swamp Club-rush | Clement | A3 | 152--5--inu | (R. Br.) Poir. | 0920008723 | |
| Scirpus nodosus | Knotted Club-rush | Clement | A3 | 152--5--nod | Rottb. | 0920008724 | |
| Scirpus sylvaticus | Wood Club-rush | Page 81 | A1 | 152--5--1 | N | L. | 0920001861 |
| Scleranthus annuus | Annual Knawel | Page 81 | A1 | 46--11--2 | N | L. | 0920001862 |
| Scleranthus annuus subsp. annuus | Yes | A1 | 46--11--2--a | 0920001862.1 | |||
| Scleranthus annuus subsp. polycarpos | Yes | A1 | 46--11--2--b | N | (L.) Bonnier & Layens | 0920001862.2 | |
| Scleranthus perennis | Perennial Knawel | Yes | A1 | 46--11--1 | L. | 0920001863 | |
| Scleranthus perennis subsp. perennis | Yes | A1 | 46--11--1--a | N | 0920001863.1 | ||
| Scleranthus perennis subsp. prostratus | Yes | A1 | 46--11--1--b | N | P.D. Sell | 0920001863.2 | |
| Scleria bracteata | Clement | A3 | 152--SCL--bra | Cav. | 0920005590 | ||
| Sclerochloa dura | Clement | A3 | 153--SCL--dur | (L.) P. Beauv. | 0920008725 | ||
| Sclerolaena anisacanthoides | Clement | A3 | 43--SCL--ani | (F. Muell.) Domin | 0920008726 | ||
| Sclerolaena birchii | Galvanized Bur | Clement | A3 | 43--SCL--bir | (F. Muell.) Domin | 0920008727 | |
| Sclerolaena divaricata | Tangled Bassia | Clement | A3 | 43--SCL--div | (R. Br.) Domin | 0920008728 | |
| Sclerolaena muricata | Five-spined Bassia | Clement | A3 | 43--SCL--mur | (Moq.) Domin | 0920008729 | |
| Scolymus grandiflorus | Clement | A3 | 135--SCO--gra | Desf. | 0920008730 | ||
| Scolymus hispanicus | Golden Thistle | Stace | A2 | 135--SCO--his | Ca | L. | 0920008207 |
| Scolymus maculatus | Clement | A3 | 135--SCO--mac | L. | 0920008208 | ||
| Scopolia carniolica | Scopolia | Clement | A3 | 110--SCO--car | Jacq. | 0920008209 | |
| Scorpiurus muricatus | Caterpillar-plant | Stace | A2 | 77--SCO--mur | Ca | L. | 0920008210 |
| Scorpiurus vermiculatus | Clement | A3 | 77--SCO--ver | L. | 0920008731 | ||
| Scorzonera hispanica | Scorzonera | Clement | A3 | 135--18--his | L. | 0920008211 | |
| Scorzonera humilis | Viper's-grass | Yes | A1 | 135--18--1 | ?N | L. | 0920001864 |
| Scrophularia auriculata | Water Figwort | Page 81 | A1 | 124--2--2 | N | L. | 0920001865 |
| Scrophularia canina | French Figwort | Clement | A3 | 124--2--can | L. | 0920001866 | |
| Scrophularia nodosa | Common Figwort | Page 83 | A1 | 124--2--1 | N | L. | 0920001867 |
| Scrophularia peregrina | Nettle-leaved Figwort | Clement | A3 | 124--2--per | L. | 0920004238 | |
| Scrophularia scopolii | Italian Figwort | Clement | A3 | 124--2--sco | Hoppe ex Pers. | 0920008732 | |
| Scrophularia scorodonia | Balm-leaved Figwort | Yes | A1 | 124--2--4 | Ne | L. | 0920001868 |
| Scrophularia umbrosa | Green Figwort | Yes | A1 | 124--2--3 | N | Dumort. | 0920001869 |
| Scrophularia vernalis | Yellow Figwort | Yes | A1 | 124--2--5 | Ne | L. | 0920001870 |
| Scutellaria altissima | Somerset Skullcap | Yes | A1 | 118--10--1 | Ne | L. | 0920001871 |
| Scutellaria galericulata | Skullcap | Page 83 | A1 | 118--10--2 | N | L. | 0920001872 |
| Scutellaria galericulata x minor = S. x hybrida | Yes | A1 | 118--10--2 x 4 | Strail | 0920002924 | ||
| Scutellaria hastifolia | Norfolk Skullcap | Clement | A3 | 118--10--has | Ne | L. | 0920001873 |
| Scutellaria minor | Lesser Skullcap | Page 83 | A1 | 118--10--4 | N | Huds. | 0920001874 |
| Secale cereale | Rye | Stace | A2 | 153--SEC--cer | Ca | L. | 0920004369 |
| Secale montanum | Clement | A3 | 153--SEC--mon | Guss. | 0920008733 | ||
| Securigera cretica | Clement | A3 | 77--13--cre | (L.) Lassen | 0920008734 | ||
| Securigera securidaca | Hatchet Vetch | Clement | A3 | 77--13--sec | (L.) Degen & D”rfl. | 0920004258 | |
| Securigera varia | Crown Vetch | Yes | A1 | 77--13--1 | Ne | (L.) Lassen | 0920000550 |
| Sedum acre | Biting Stonecrop | Page 83 | A1 | 73--5--12 | N | L. | 0920001875 |
| Sedum album | White Stonecrop | Page 83 | A1 | 73--5--14 | Ar | L. | 0920001876 |
| Sedum anacampseros | Love-restoring Stonecrop | Yes | A1 | 73--5--6 | Ne | L. | 0920007570 |
| Sedum anglicum | English Stonecrop | Page 83 | A1 | 73--5--16 | N | Huds. | 0920001877 |
| Sedum cepaea | Pink Stonecrop | Clement | A3 | 73--5--cep | L. | 0920008212 | |
| Sedum confusum | Lesser Mexican-stonecrop | Yes | A1 | 73--5--3 | Ne | Hemsl. | 0920007571 |
| Sedum dasyphyllum | Thick-leaved Stonecrop | Yes | A1 | 73--5--17 | Ne | L. | 0920001878 |
| Sedum forsterianum | Rock Stonecrop | Page 83 | A1 | 73--5--11 | N | Sm. | 0920001879 |
| Sedum hispanicum | Spanish Stonecrop | Yes | A1 | 73--5--19 | Ne | L. | 0920007572 |
| Sedum hybridum | Siberian Stonecrop | Clement | A3 | 73--5--hyb | L. | 0920008213 | |
| Sedum kamtschaticum | Kamchatka Stonecrop | Yes S1 | A1 | 73--5--kam | Ne | Mast. | 0920007836 |
| Sedum lydium | Least Stonecrop | Yes | A1 | 73--5--15 | Ne | Boiss. | 0920001880 |
| Sedum mexicanum | Mexican-stonecrop | Clement | A3 | 73--5--mex | Britton | 0920008735 | |
| Sedum nicaeense | Pale Stonecrop | Yes | A1 | 73--5--9 | Ne | All. | 0920007573 |
| Sedum pallidum | Clement | A3 | 73--5--pal | M. Bieb. | 0920008736 | ||
| Sedum populifolium | Clement | A3 | 73--5--pop | Pall. | 0920008737 | ||
| Sedum praealtum | Greater Mexican-stonecrop | Yes | A1 | 73--5--2 | Ne | A. DC. | 0920007574 |
| Sedum rosea | Roseroot | Page 83 | A1 | 73--5--1 | N | (L.) Scop. | 0920001882 |
| Sedum rubrotinctum | Jelly-beans | Clement | A3 | 73--5--rub | R.T. Clausen | 0920008738 | |
| Sedum rupestre | Reflexed Stonecrop | Page 83 | A1 | 73--5--10 | Ne | L. | 0920001881 |
| Sedum sexangulare | Tasteless Stonecrop | Yes | A1 | 73--5--13 | Ne | L. | 0920001883 |
| Sedum sieboldii | Clement | A3 | 73--5--sie | Sweet ex Hook. | 0920008739 | ||
| Sedum spathulifolium | Colorado Stonecrop | Yes S1 | A1 | 73--5--spa | Ne | Hook. | 0920008214 |
| Sedum spectabile | Butterfly Stonecrop | Yes | A1 | 73--5--4 | Ne | Boreau | 0920007575 |
| Sedum spectabile x telephium = S. 'Herbstfreude' | Autumn Stonecrop | Yes S3 | A1 | 73--5--- | |||
| Sedum spurium | Caucasian-stonecrop | Yes | A1 | 73--5--7 | Ne | M. Bieb. | 0920001884 |
| Sedum stellatum | Starry Stonecrop | Yes S2 | A1 | 73--5--ste | L. | 0920004163 | |
| Sedum stoloniferum | Lesser Caucasian-stonecrop | Yes | A1 | 73--5--8 | Ne | S.G. Gmel. | 0920007576 |
| Sedum telephium | Orpine | Page 83 | A1 | 73--5--5 | N | L. | 0920001885 |
| Sedum telephium subsp. fabaria | Yes | A1 | 73--5--5--b | Syme | 0920001885.1 | ||
| Sedum telephium subsp. maximum | Clement | A3 | 73--5--5--c | (L.) Krock. | 0920001885.3 | ||
| Sedum telephium subsp. telephium | Yes | A1 | 73--5--5--a | 0920001885.2 | |||
| Sedum villosum | Hairy Stonecrop | Yes | A1 | 73--5--18 | N | L. | 0920001886 |
| Seidelia mercurialis | Clement | A3 | 91--SEI--mer | Baill. | 0920008740 | ||
| Selaginella kraussiana | Krauss's Clubmoss | Yes | A1 | 2--1--2 | Ne | (Kunze) A. Braun | 0910001887 |
| Selaginella selaginoides | Lesser Clubmoss | Page 83 | A1 | 2--1--1 | N | (L.) P. Beauv. | 0910001888 |
| Selago corymbosa | Clement | A3 | 124A--SEL--cor | L. | 0920008741 | ||
| Selinum carvifolia | Cambridge Milk-parsley | Yes | A1 | 107--35--1 | N | (L.) L. | 0920001889 |
| Semiarundinaria fastuosa | Narihira Bamboo | Yes S1 | A1 | 153--SEM--fas | Ne | (Lat.-Marl. ex Mitford) Makino ex Nakai | 0920004311 |
| Sempervivum andreanum | Clement | A3 | 73--3--and | Wale | 0920008742 | ||
| Sempervivum arachnoideum | Cobweb House-leek | Yes S1 | A1 | 73--3--ara | Ne | L. | 0920003563 |
| Sempervivum montanum | Mountain House-leek | Clement | A3 | 73--3--mon | L. | 0920008743 | |
| Sempervivum tectorum | House-leek | Yes | A1 | 73--3--1 | Ne | L. | 0920001890 |
| Senecio aegyptius | Clement | A3 | 135--62--aeg | L. | 0920008744 | ||
| Senecio aquaticus | Marsh Ragwort | Page 83 | A1 | 135--62--11 | N | Hill | 0920001891 |
| Senecio arenarius | Clement | A3 | 135--62--are | Thunb. | 0920008745 | ||
| Senecio bipinnatisectus | Australian Fireweed | Clement | A3 | 135--62--bip | Belcher | 0920008746 | |
| Senecio brasiliensis | Clement | A3 | 135--62--bra | Less. | 0920008747 | ||
| Senecio cambrensis | Welsh Groundsel | Yes | A1 | 135--62--14 | N | Rosser | 0920002294 |
| Senecio caracasanus | Clement | A3 | 135--62--car | Klatt | 0920008748 | ||
| Senecio cineraria | Silver Ragwort | Yes | A1 | 135--62--1 | Ne | DC. | 0920001892 |
| Senecio cineraria x erucifolius = S. x thuretii | Yes | A1 | 135--62--1 x 12 | Briq. & Cavill. | 0920007582 | ||
| Senecio cineraria x jacobaea = S. x albescens | Yes | A1 | 135--62--1 x 10 | ? | Burb. & Colgan | 0920002821 | |
| Senecio doria | Golden Ragwort | Yes | A1 | 135--62--6 | Ne | L. | 0920001894 |
| Senecio doronicum | Chamois Ragwort | Yes | A1 | 135--62--8 | Ne | (L.) L. | 0920007577 |
| Senecio eboracensis | Yes S3 | A1 | 135--62--ebo | R.J. Abbott & A.J. Lowe | |||
| Senecio elegans | Purple Groundsel | Clement | A3 | 135--62--ele | L. | 0920004239 | |
| Senecio erucifolius | Hoary Ragwort | Page 83 | A1 | 135--62--12 | N | L. | 0920001896 |
| Senecio fluviatilis | Broad-leaved Ragwort | Yes | A1 | 135--62--4 | Ne | Wallr. | 0920001897 |
| Senecio gallicus | French Groundsel | Clement | A3 | 135--62--gal | Chaix | 0920008749 | |
| Senecio glastifolius | Woad-leaved Ragwort | Clement, S1,S3 | A3 | 135--62--gla | Ne | L. f. | 0920003564 |
| Senecio glomeratus | Annual Fireweed | Clement | A3 | 135--62--glo | Desf. ex Poir. | 0920008750 | |
| Senecio glossanthus | Slender Groundsel | Clement | A3 | 135--62--gls | (Sond.) Belcher | 0920008751 | |
| Senecio grandiflorus | Purple Ragwort | Yes | A1 | 135--62--2 | Ne | P.J. Bergius | 0920007578 |
| Senecio hieracioides | Clement | A3 | 135--62--hie | DC. | 0920008752 | ||
| Senecio inaequidens | Narrow-leaved Ragwort | Yes | A1 | 135--62--3 | Ne | DC. | 0920007579 |
| Senecio jacobaea | Common Ragwort | Page 83 | A1 | 135--62--10 | N | L. | 0920001899 |
| Senecio jacobaea x aquaticus = S. x ostenfeldii | Yes | A1 | 135--62--10 x 11 | N | Druce | 0920002612 | |
| Senecio juniperinus | Clement | A3 | 135--62--jun | L. f. | 0920008753 | ||
| Senecio leucanthemifolius | Clement | A3 | 135--62--leu | Poir. | 0920008754 | ||
| Senecio linearifolius | Fireweed Groundsel | Clement | A3 | 135--62--lin | A. Rich. | 0920008755 | |
| Senecio minimus | Toothed Fireweed | Yes S3 | A1 | 135--62--min | Poir. | 0920008756 | |
| Senecio nudiusculus | Clement | A3 | 135--62--nud | DC. | 0920008757 | ||
| Senecio oederiifolius | Clement | A3 | 135--62--oed | DC. | 0920008758 | ||
| Senecio ovatus | Wood Ragwort | Yes | A1 | 135--62--5 | Ne | (P. Gaertn., B. Mey. & Scherb.) Willd. | 0920007580 |
| Senecio paludosus | Fen Ragwort | Yes | A1 | 135--62--7 | N | L. | 0920001900 |
| Senecio pinnulatus | Clement | A3 | 135--62--pin | Thunb. | 0920008759 | ||
| Senecio pterophorus | Shoddy Ragwort | Stace | A2 | 135--62--pte | Ca | DC. | 0920008215 |
| Senecio quadridentatus | Cotton Fireweed | Clement | A3 | 135--62--qua | Labill. | 0920008760 | |
| Senecio smithii | Magellan Ragwort | Yes | A1 | 135--62--9 | Ne | DC. | 0920004436 |
| Senecio squalidus | Oxford Ragwort | Page 83 | A1 | 135--62--13 | Ne | L. | 0920001902 |
| Senecio squalidus x viscosus = S. x subnebrodensis | Yes | A1 | 135--62--13 x 18 | ? | Simonk. | 0920002625 | |
| Senecio squalidus x vulgaris = S. x baxteri | Yes | A1 | 135--62--13 x 15 | ? | Druce | 0920002822 | |
| Senecio sylvaticus | Heath Groundsel | Page 83 | A1 | 135--62--17 | N | L. | 0920001903 |
| Senecio sylvaticus x viscosus = S. x viscidulus | Yes | A1 | 135--62--17 x 18 | Scheele | 0920002823 | ||
| Senecio vernalis | Eastern Groundsel | Yes | A1 | 135--62--16 | Ne | Waldst. & Kit. | 0920002553 |
| Senecio viscosus | Sticky Groundsel | Page 83 | A1 | 135--62--18 | Ne | L. | 0920001904 |
| Senecio vulgaris | Groundsel | Page 83 | A1 | 135--62--15 | N | L. | 0920001905 |
| Senecio vulgaris x vernalis = S. x helwingii | Yes | A1 | 135--62--15 x 16 | Beger ex Hegi | 0920007581 | ||
| Senna obtusifolia | American Sicklepod | Clement | A3 | 76A--SEN--obt | (L.) Irwin & Barneby | 0920005686 | |
| Senna occidentalis | Coffee Senna | Clement | A3 | 76A--SEN--occ | (L.) Link | 0920008761 | |
| Sequoia sempervirens | Coastal Redwood | Yes S1 | A1 | 20A--SEQ--sem | Ne | (D. Don) Endl. | 0920002417 |
| Sequoiadendron giganteum | Wellingtonia | Stace | A2 | 20A--Sqd--gig | Ne | (Lindl.) Buchholz | 0920002410 |
| Serapias lingua | Tongue-orchid | Clement | A3 | 162--SER--lin | L. | 0920004242 | |
| Serapias neglecta | Scarce Tongue-orchid | Clement | A3 | 162--SER--neg | De Not. | 0920008762 | |
| Serapias parviflora | Small-flowered Tongue-orchid | Yes S3 | A1 | 162--SER--par | ?N | Parl. | 0920004243 |
| Seriphidium compactum | Clement | A3 | 135--49--com | (Fisch. ex DC.) Poljakov | 0920008763 | ||
| Seriphidium maritimum | Sea Wormwood | Page 83 | A1 | 135--49--1 | N | (L.) Poljakow | 0920000172 |
| Serratula tinctoria | Saw-wort | Page 83 | A1 | 135--9--1 | N | L. | 0920001906 |
| Sesamum orientale | Sesame | Clement | A3 | 127A--SES--ori | L. | 0920005693 | |
| Sesbania benthamiana | Clement | A3 | 77--SES--ben | Domin | 0920008764 | ||
| Sesbania bispinosa | Clement | A3 | 77--SES--bis | (Jacq.) W. Wight | 0920008765 | ||
| Sesbania exaltata | Colorado River-hemp | Clement | A3 | 77--SES--exa | (Raf.) Cory | 0920008217 | |
| Seseli libanotis | Moon Carrot | Yes | A1 | 107--18--1 | N | (L.) W.D.J. Koch | 0920001907 |
| Sesleria caerulea | Blue Moor-grass | Page 85 | A1 | 153--22--1 | N | (L.) Ard. | 0920001908 |
| Setaria adhaerens | Adherent Bristle-grass | Stace | A2 | 153--70--adh | Ca | (Forssk.) Chiov. | 0920003295 |
| Setaria dielsii | Clement | A3 | 153--70--die | Herrm. | 0920008766 | ||
| Setaria faberi | Nodding Bristle-grass | Stace | A2 | 153--70--fab | Ca | Herrm. | 0920003296 |
| Setaria italica | Foxtail Bristle-grass | Stace | A2 | 153--70--ita | Ca | (L.) P. Beauv. | 0920004438 |
| Setaria parviflora | Knotroot Bristle-grass | Stace | A2 | 153--70--par | Ca | (Poir.) Kergu‚len | 0920003294 |
| Setaria pumila | Yellow Bristle-grass | Yes S1, S3 | A1 | 153--70--pum | Ne | (Poir.) Roem. & Schult. | 0920001909 |
| Setaria verticillata | Rough Bristle-grass | Stace | A2 | 153--70--ver | Ca | (L.) P. Beauv. | 0920001910 |
| Setaria viridis | Green Bristle-grass | Yes | A1 | 153--70--1 | Ne | (L.) P. Beauv. | 0920001911 |
| Setaria vulpiseta | Clement | A3 | 153--70--vul | (Lam.) Roem. & Schult. | 0920008767 | ||
| Sherardia arvensis | Field Madder | Page 85 | A1 | 130--3--1 | N | L. | 0920001912 |
| Sibbaldia procumbens | Sibbaldia | Yes | A1 | 75--10--1 | N | L. | 0920001913 |
| Sibthorpia europaea | Cornish Moneywort | Yes | A1 | 124--18--1 | N | L. | 0920001914 |
| Sicyos angulatus | Bur Cucumber | Clement | A3 | 60--SIC--ang | L. | 0920008218 | |
| Sida cordifolia | Flannel Weed | Clement | A3 | 53--SID--cor | L. | 0920008768 | |
| Sida glomerata | Clement | A3 | 53--SID--glo | Cav. | 0920008769 | ||
| Sida rhombifolia | Queensland-hemp | Stace | A2 | 53--SID--rho | Ca | L. | 0920008219 |
| Sida spinosa | Prickly Mallow | Stace | A2 | 53--SID--spi | Ca | L. | 0920008220 |
| Sidalcea candida | Prairie Mallow | Yes S1 | A1 | 53--5--can | Ne | A. Gray | 0920003565 |
| Sidalcea malviflora | Greek Mallow | Yes | A1 | 53--5--1 | Ne | (DC.) A. Gray ex Benth. | 0920007583 |
| Sideritis hyssopifolia | Clement | A3 | 118--SID--hys | L. | 0920008770 | ||
| Sideritis lanata | Clement | A3 | 118--SID--lan | L. | 0920008771 | ||
| Sideritis montana | Mountain Ironwort | Clement | A3 | 118--SID--mon | L. | 0920005592 | |
| Sideritis romana | Clement | A3 | 118--SID--rom | L. | 0920005593 | ||
| Sigesbeckia microcephala | Pale Indian-weed | Clement | A3 | 135--77--mic | DC. | 0920008772 | |
| Sigesbeckia orientalis | Eastern St Paul's-wort | Stace | A2 | 135--77--ori | Ca | L. | 0920005444 |
| Sigesbeckia serrata | Western St Paul's-wort | Yes | A1 | 135--77--1 | Ne | DC. | 0920005443 |
| Silaum silaus | Pepper-saxifrage | Page 85 | A1 | 107--22--1 | N | (L.) Schinz & Thell. | 0920001916 |
| Silene acaulis | Moss Campion | Page 85 | A1 | 46--20--6 | N | (L.) Jacq. | 0920001917 |
| Silene antirrhina | Sleepy Catchfly | Clement | A3 | 46--20--ant | L. | 0920008773 | |
| Silene apetala | Clement | A3 | 46--20--ape | Willd. | 0920008774 | ||
| Silene armeria | Sweet-William Catchfly | Yes | A1 | 46--20--7 | Ne | L. | 0920001920 |
| Silene behen | Clement | A3 | 46--20--beh | L. | 0920008775 | ||
| Silene bellidifolia | Clement | A3 | 46--20--bel | C. Juss. ex Jacq. | 0920008776 | ||
| Silene catholica | Clement | A3 | 46--20--cat | (L.) W.T. Aiton | 0920008777 | ||
| Silene coeli-rosa | Rose-of-heaven | Stace | A2 | 46--20--coe | Ca | (L.) Godr. | 0920005406 |
| Silene conica | Sand Catchfly | Yes | A1 | 46--20--12 | N | L. | 0920001921 |
| Silene conoidea | Clement | A3 | 46--20--con | L. | 0920001922 | ||
| Silene cordifolia | Heart-leaved Catchfly | Clement | A3 | 46--20--cor | All. | 0920005657 | |
| Silene cretica | Clement | A3 | 46--20--cre | L. | 0920008223 | ||
| Silene cserei | Clement | A3 | 46--20--cse | Baumg. | 0920008778 | ||
| Silene dichotoma | Forked Catchfly | Clement | A3 | 46--20--dic | Ehrh. | 0920001924 | |
| Silene dioica | Red Campion | Page 85 | A1 | 46--20--10 | N | (L.) Clairv. | 0920001259 |
| Silene fabaria | Clement | A3 | 46--20--fab | (L.) Sibth. & Sm. | 0920004244 | ||
| Silene fimbriata | Fringed Campion | Yes S2 | A1 | 46--20--fim | (Gueldenst. ex M. Bieb.) Sims | 0920005412 | |
| Silene gallica | Small-flowered Catchfly | Yes | A1 | 46--20--11 | Ar | L. | 0920001918 |
| Silene holzmannii | Clement | A3 | 46--20--hol | Heldr. ex Boiss. | 0920008779 | ||
| Silene inaperta | Clement | A3 | 46--20--ina | L. | 0920008780 | ||
| Silene integripetala | Clement | A3 | 46--20--int | Bory & Chaub. | 0920008781 | ||
| Silene italica | Italian Catchfly | Yes | A1 | 46--20--1 | Ne | (L.) Pers. | 0920001925 |
| Silene laeta | Clement | A3 | 46--20--lae | (Aiton) Godr. | 0920008782 | ||
| Silene latifolia | White Campion | Page 85 | A1 | 46--20--9 | Ar | Poir. | 0920001258 |
| Silene latifolia subsp. alba | Yes | A1 | 46--20--9--a | (Mill.) Greuter & Burdet | 0920001258.1 | ||
| Silene latifolia subsp. latifolia | Clement | A3 | 46--20--9--b | 0920001258.2 | |||
| Silene latifolia x dioica = S. x hampeana | Yes | A1 | 46--20--9 x 10 | ? | Meusel & K. Werner | 0920001260 | |
| Silene lydia | Clement | A3 | 46--20--lyd | Boiss. | 0920008783 | ||
| Silene muscipula | Clement | A3 | 46--20--mus | L. | 0920001927 | ||
| Silene noctiflora | Night-flowering Catchfly | Page 85 | A1 | 46--20--8 | Ar | L. | 0920001261 |
| Silene nocturna | Mediterranean Catchfly | Clement | A3 | 46--20--noc | L. | 0920004259 | |
| Silene nutans | Nottingham Catchfly | Yes | A1 | 46--20--2 | N | L. | 0920001928 |
| Silene otites | Spanish Catchfly | Yes | A1 | 46--20--3 | N | (L.) Wibel | 0920001929 |
| Silene pendula | Nodding Catchfly | Stace | A2 | 46--20--pen | Ca | L. | 0920005413 |
| Silene portensis | Clement | A3 | 46--20--por | L. | 0920008784 | ||
| Silene pseudatocion | Clement | A3 | 46--20--pse | Desf. | 0920008785 | ||
| Silene pusilla | Alpine Catchfly | Clement | A3 | 46--20--pus | Waldst. & Kit. | 0920008786 | |
| Silene quadrifida | Alpine Campion | Yes S1 | A1 | 46--20--qua | Ne | (L.) L. | 0920003566 |
| Silene rubella | Clement | A3 | 46--20--rub | L. | 0920005694 | ||
| Silene schafta | Caucasian Campion | Yes S3 | A1 | 46--20--sch | C.C. Gmel. ex Hohen. | 0920005414 | |
| Silene sedoides | Clement | A3 | 46--20--sed | Poir. | 0920005621 | ||
| Silene stricta | Clement | A3 | 46--20--str | L. | 0920008787 | ||
| Silene tatarica | Clement | A3 | 46--20--tat | (L.) Pers. | 0920008788 | ||
| Silene tridentata | Clement | A3 | 46--20--tri | Desf. | 0920008789 | ||
| Silene trinervia | Clement | A3 | 46--20--trn | Sebast. & Mauri | 0920008790 | ||
| Silene uniflora | Sea Campion | Page 85 | A1 | 46--20--5 | N | Roth | 0920001926 |
| Silene vulgaris | Bladder Campion | Page 85 | A1 | 46--20--4 | N | (Moench) Garcke | 0920004578 |
| Silene vulgaris subsp. angustifolia | Clement | A3 | 46--20--4--c | (Mill.) Hayek | 0920008791 | ||
| Silene vulgaris subsp. commutata | Clement | A3 | 46--20--4--d | (Guss.) Hayek | 0920008792 | ||
| Silene vulgaris subsp. macrocarpa | Yes | A1 | 46--20--4--b | Turrill | 0920001919 | ||
| Silene vulgaris subsp. vulgaris | Yes | A1 | 46--20--4--a | 0920001923 | |||
| Silene vulgaris x uniflora | Yes | A1 | 46--20--4 x 5 | 0920007584 | |||
| Silphium perfoliatum | Cup-plant | Clement | A3 | 135--SIL--per | L. | 0920008793 | |
| Silybum marianum | Milk Thistle | Yes | A1 | 135--8--1 | Ar | (L.) Gaertn. | 0920001930 |
| Simethis planifolia | Kerry Lily | Yes | A1 | 158--4--1 | N | (L.) Gren. | 0920001931 |
| Simsia foetida | Clement | A3 | 135--SIM--foe | (Cav.) Blake | 0920008794 | ||
| Sinacalia tangutica | Chinese Ragwort | Yes | A1 | 135--67--1 | Ne | (Maxim.) B. Nord. | 0920007585 |
| Sinapis alba | White Mustard | Page 85 | A1 | 62--35--2 | Ar | L. | 0920001932 |
| Sinapis alba subsp. alba | Stace | A2 | 62--35--2--a | 0920001932.1 | |||
| Sinapis alba subsp. dissecta | Stace | A2 | 62--35--2--b | Ne | (Lag.) Bonnier | 0920001932.2 | |
| Sinapis allionii | Clement | A3 | 62--35--all | Jacq. | 0920008795 | ||
| Sinapis arvensis | Charlock | Page 85 | A1 | 62--35--1 | Ar | L. | 0920001933 |
| Sinapis flexuosa | Clement | A3 | 62--35--fle | Poir. | 0920008225 | ||
| Sison amomum | Stone Parsley | Page 85 | A1 | 107--30--1 | N | L. | 0920001934 |
| Sisymbrium altissimum | Tall Rocket | Page 85 | A1 | 62--1--5 | Ne | L. | 0920001935 |
| Sisymbrium austriacum | Austrian Rocket | Clement | A3 | 62--1--aus | Jacq. | 0920004493 | |
| Sisymbrium burchellii | Clement | A3 | 62--1--bur | DC. | 0920008796 | ||
| Sisymbrium capense | Clement | A3 | 62--1--cap | Thunb. | 0920008797 | ||
| Sisymbrium erysimoides | French Rocket | Stace | A2 | 62--1--ery | Ca | Desf. | 0920002642 |
| Sisymbrium irio | London-rocket | Yes | A1 | 62--1--2 | Ne | L. | 0920001936 |
| Sisymbrium loeselii | False London-rocket | Yes | A1 | 62--1--3 | Ne | L. | 0920001937 |
| Sisymbrium officinale | Hedge Mustard | Page 85 | A1 | 62--1--7 | Ar | (L.) Scop. | 0920001938 |
| Sisymbrium orientale | Eastern Rocket | Page 85 | A1 | 62--1--6 | Ne | L. | 0920001939 |
| Sisymbrium polyceratium | Clement | A3 | 62--1--poc | L. | 0920001940 | ||
| Sisymbrium polymorphum | Clement | A3 | 62--1--pol | (Murray) Roth | 0920008798 | ||
| Sisymbrium runcinatum | Clement | A3 | 62--1--run | Lag. ex DC. | 0920002643 | ||
| Sisymbrium septulatum | Clement | A3 | 62--1--sep | DC. | 0920008799 | ||
| Sisymbrium strictissimum | Perennial Rocket | Yes | A1 | 62--1--1 | Ne | L. | 0920001941 |
| Sisymbrium thellungii | Clement | A3 | 62--1--the | O.E. Schulz | 0920008800 | ||
| Sisymbrium volgense | Russian Mustard | Yes | A1 | 62--1--4 | Ne | M. Bieb. ex E. Fourn. | 0920002644 |
| Sisyrinchium bermudiana | Blue-eyed-grass | Yes | A1 | 159--2--1 | N | L. | 0920001942 |
| Sisyrinchium californicum | Yellow-eyed-grass | Yes | A1 | 159--2--3 | Ne | (Ker Gawl.) W.T. Aiton | 0920001943 |
| Sisyrinchium laxum | Veined Yellow-eyed-grass | Yes | A1 | 159--2--4 | Ne | Otto ex Sims | 0920007586 |
| Sisyrinchium montanum | American Blue-eyed-grass | Yes | A1 | 159--2--2 | Ne | Greene | 0920002651 |
| Sisyrinchium platense | Clement | A3 | 159--2--pla | Johnst. | 0920008801 | ||
| Sisyrinchium striatum | Pale Yellow-eyed-grass | Yes | A1 | 159--2--5 | Ne | Sm. | 0920007587 |
| Sium latifolium | Greater Water-parsnip | Yes | A1 | 107--15--1 | N | L. | 0920001944 |
| Skimmia japonica | Clement | A3 | 101A--SKI--jap | Thunb. | 0920004052 | ||
| Smilacina stellata | Star-flowered Lily-of-the-valley | Clement | A3 | 158--SMI--ste | (L.) Desf. | 0920008802 | |
| Smilax aspera | Common Smilax | Clement | A3 | 158--SMX--asp | L. | 0920008803 | |
| Smilax excelsa | Larger Smilax | Clement | A3 | 158--SMX--exc | L. | 0920004164 | |
| Smyrnium olusatrum | Alexanders | Page 85 | A1 | 107--10--1 | Ar | L. | 0920001945 |
| Smyrnium perfoliatum | Perfoliate Alexanders | Yes | A1 | 107--10--2 | Ne | L. | 0920004383 |
| Snowdenia polystachya | Clement | A3 | 153--SNO--pol | (Fresen.) Pilg. | 0920008804 | ||
| Solanum acaule | Clement | A3 | 110--8--aca | Bitter | 0920008805 | ||
| Solanum americanum | Small-flowered Nightshade | Clement | A3 | 110--8--ame | Mill. | 0920002538 | |
| Solanum capsicoides | Cockroach-berry | Clement | A3 | 110--8--cap | All. | 0920008806 | |
| Solanum carolinense | Horse-nettle | Stace | A2 | 110--8--car | Ca | L. | 0920008228 |
| Solanum chenopodioides | Tall Nightshade | Yes | A1 | 110--8--2 | Ne | Lam. | 0920002539 |
| Solanum commersonii | Clement | A3 | 110--8--com | Dunal | 0920008807 | ||
| Solanum curtipes | Clement | A3 | 110--8--cur | Bitter | 0920008808 | ||
| Solanum dulcamara | Bittersweet | Page 85 | A1 | 110--8--6 | N | L. | 0920001947 |
| Solanum eleagnifolium | Silvery-leaved Nightshade | Clement | A3 | 110--8--ele | Cav. | 0920008809 | |
| Solanum fontanesianum | Clement | A3 | 110--8--fon | Dunal | 0920008810 | ||
| Solanum jamesii | Wild Potato | Clement | A3 | 110--8--jam | Torr. | 0920008811 | |
| Solanum laciniatum | Kangaroo-apple | Yes | A1 | 110--8--8 | Ne | Aiton | 0920007588 |
| Solanum linnaeanum | Apple of Sodom | Clement | A3 | 110--8--lin | Hepper & P.-M.L. Jaeger | 0920008812 | |
| Solanum maritimum | Clement | A3 | 110--8--mar |