| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| RUGR3 | Ruta graveolens L. | common rue | Rutaceae
|
| RUTA5 | Ruta L. | rue | Rutaceae
|
| RYBR | Rydbergia brandegeei (Porter ex Gray) Rydb. | Tetraneuris brandegeei | Asteraceae
|
| RYGR2 | Rydbergia grandiflora (Torr. & Gray ex Gray) Greene | Tetraneuris grandiflora | Asteraceae
|
| RYPI | Rytidosperma pilosum (R. Br.) Connor & Edgar | hairy wallaby grass | Poaceae
|
| RYSE | Rytidosperma semiannulare (Labill.) Connor & Edgar | Tasmanian wallaby grass | Poaceae
|
| RYTID2 | Rytidosperma Steud. | wallaby grass | Poaceae
|
| RYGR | Rytilix granularis (L.) Skeels | Hackelochloa granularis | Poaceae
|
| SASE15 | Saba senegalensis (A. DC.) Pichon | Senegal saba | Apocynaceae
|
| SABA15 | Saba (Pichon) Pichon | saba | Apocynaceae
|
| SAAD3 | Sabal adansonii Guersent | Sabal minor | Arecaceae
|
| SACA | Sabal causiarum (O.F. Cook) Becc. | Puerto Rico palmetto | Arecaceae
|
| SADE9 | Sabal deeringiana Small | Sabal minor | Arecaceae
|
| SAET | Sabal etonia Swingle ex Nash | scrub palmetto | Arecaceae
|
| SAEX5 | Sabal exul (O.F. Cook) Bailey | Sabal mexicana | Arecaceae
|
| SAGL13 | Sabal glabra Sarg., non P. Mill. | Sabal minor | Arecaceae
|
| SAJA6 | Sabal jamesiana Small | Sabal palmetto | Arecaceae
|
| SALO14 | Sabal louisiana (Darby) Bomhard | Sabal minor | Arecaceae
|
| SAME8 | Sabal mexicana Mart. | Rio Grande palmetto | Arecaceae
|
| SAMI14 | Sabal miamiensis Zona | Sabal etonia | Arecaceae
|
| SAMI8 | Sabal minor (Jacq.) Pers. | dwarf palmetto | Arecaceae
|
| SAPA | Sabal palmetto (Walt.) Lodd. ex J.A. & J.H. Schultes | cabbage palmetto | Arecaceae
|
| SATE8 | Sabal texana (O.F. Cook) Becc. | Sabal mexicana | Arecaceae
|
| SABAL | Sabal Adans. | palmetto | Arecaceae
|
| SAAL12 | Sabatia alainii Victorin | Sabatia grandiflora | Gentianaceae
|
| SAAN | Sabatia angularis (L.) Pursh | rosepink | Gentianaceae
|
| SAAR | Sabatia arenicola Greenm. | sand rose gentian | Gentianaceae
|
| SABA8 | Sabatia bartramii Wilbur | Bartram's rose gentian | Gentianaceae
|
| SABO4 | Sabatia boykinii Gray | Sabatia capitata | Gentianaceae
|
| SABR9 | Sabatia brachiata Ell. | narrowleaf rose gentian | Gentianaceae
|
| SABR10 | Sabatia brevifolia Raf. | shortleaf rose gentian | Gentianaceae
|
| SACA2 | Sabatia calycina (Lam.) Heller | coastal rose gentian | Gentianaceae
|
| SACAG3 | Sabatia campanulata (L.) Torr. var. gracilis (Michx.) Fern. | Sabatia campanulata | Gentianaceae
|
| SACAG8 | Sabatia campanulata (L.) Torr. var. grandiflora (Gray) Blake | Sabatia grandiflora | Gentianaceae
|
| SACA26 | Sabatia campanulata (L.) Torr. | slender rose gentian | Gentianaceae
|
| SACA3 | Sabatia campestris Nutt. | Texas star | Gentianaceae
|
| SACA27 | Sabatia capitata (Raf.) Blake | Appalachian rose gentian | Gentianaceae
|
| SACA32 | Sabatia carnosa Small | Sabatia arenicola | Gentianaceae
|
| SACH8 | Sabatia chloroides (Michx.) Pursh | Sabatia dodecandra var. dodecandra | Gentianaceae
|
| SACO27 | Sabatia corymbosa Baldw. | Sabatia difformis | Gentianaceae
|
| SACU4 | Sabatia cubensis (Griseb.) Urban | Sabatia calycina | Gentianaceae
|
| SADE6 | Sabatia decandra (Walt.) Harper | Sabatia bartramii | Gentianaceae
|
| SADI2 | Sabatia difformis (L.) Druce | lanceleaf rose gentian | Gentianaceae
|
| SADOC3 | Sabatia dodecandra (L.) B.S.P. var. coriacea (Ell.) Ahles | Sabatia bartramii | Gentianaceae
|
| SADOD | Sabatia dodecandra (L.) B.S.P. var. dodecandra | marsh rose gentian | Gentianaceae
|
| SADOF | Sabatia dodecandra (L.) B.S.P. var. foliosa (Fern.) Wilbur | marsh rose gentian | Gentianaceae
|
| SADOK | Sabatia dodecandra (L.) B.S.P. var. kennedyana (Fern.) Ahles | Sabatia kennedyana | Gentianaceae
|
| SADO | Sabatia dodecandra (L.) B.S.P. | marsh rose gentian | Gentianaceae
|
| SAEL3 | Sabatia elliottii Steud. | Sabatia brevifolia | Gentianaceae
|
| SAFO5 | Sabatia foliosa Fern. | Sabatia dodecandra var. foliosa | Gentianaceae
|
| SAFO7 | Sabatia formosa Buckl. | stately rose gentian | Gentianaceae
|
| SAGE | Sabatia gentianoides Ell. | pinewoods rose gentian | Gentianaceae
|
| SAGRC3 | Sabatia gracilis (Michx.) Salisb. var. cubensis Griseb. | Sabatia calycina | Gentianaceae
|
| SAGRG2 | Sabatia gracilis (Michx.) Salisb. var. grandiflora Gray | Sabatia grandiflora | Gentianaceae
|
| SAGR11 | Sabatia gracilis (Michx.) Salisb. | Sabatia campanulata | Gentianaceae
|
| SAGR8 | Sabatia grandiflora (Gray) Small | largeflower rose gentian | Gentianaceae
|
| SAHA8 | Sabatia harperi Small | Sabatia dodecandra var. foliosa | Gentianaceae
|
| SAKE | Sabatia kennedyana Fern. | Plymouth rose gentian | Gentianaceae
|
| SALA11 | Sabatia lanceolata (Walt.) Torr. & Gray | Sabatia difformis | Gentianaceae
|
| SAMAM2 | Sabatia macrophylla Hook. var. macrophylla | largeleaf rose gentian | Gentianaceae
|
| SAMAR | Sabatia macrophylla Hook. var. recurvans (Small) Wilbur | largeleaf rose gentian | Gentianaceae
|
| SAMA8 | Sabatia macrophylla Hook. | largeleaf rose gentian | Gentianaceae
|
| SAMA14 | Sabatia maculata (Benth.) Benth. & Hook. f. | Sabatia stellaris | Gentianaceae
|
| SAOB2 | Sabatia obtusata Blake | Sabatia dodecandra var. foliosa | Gentianaceae
|
| SAPA27 | Sabatia palmeri Gray | Sabatia stellaris | Gentianaceae
|
| SAPA15 | Sabatia paniculata (Michx.) Pursh | Sabatia brevifolia | Gentianaceae
|
| SAPA22 | Sabatia paniculata auct. non (Michx.) Pursh | Sabatia quadrangula | Gentianaceae
|
| SAPU14 | Sabatia purpusii Brandeg. | Sabatia stellaris | Gentianaceae
|
| SAQU | Sabatia quadrangula Wilbur | fourangle rose gentian | Gentianaceae
|
| SARE9 | Sabatia recurvans Small | Sabatia macrophylla var. recurvans | Gentianaceae
|
| SASI8 | Sabatia simulata Britt. | Sabatia stellaris | Gentianaceae
|
| SAST5 | Sabatia stellaris Pursh | rose of Plymouth | Gentianaceae
|
| SABAT | Sabatia Adans. | rose gentian | Gentianaceae
|
| SACI2 | Sabicea cinerea Aubl. | largeflower woodvine | Rubiaceae
|
| SAHI8 | Sabicea hirsuta Kunth | Sabicea villosa | Rubiaceae
|
| SAVI6 | Sabicea villosa Willd. ex Roemer & J.A. Schultes | woolly woodvine | Rubiaceae
|
| SABIC | Sabicea Aubl. | woodvine | Rubiaceae
|
| SACA29 | Sabina californica (Carr.) Antoine | Juniperus californica | Cupressaceae
|
| SAFL16 | Sabina flaccida (Schlecht.) Antoine | Juniperus flaccida | Cupressaceae
|
| SAHO7 | Sabina horizontalis (Moench) Rydb. | Juniperus horizontalis | Cupressaceae
|
| SAMO8 | Sabina monosperma (Engelm.) Rydb. | Juniperus monosperma | Cupressaceae
|
| SAOC9 | Sabina occidentalis (Hook.) Heller | Juniperus occidentalis var. occidentalis | Cupressaceae
|
| SAOS | Sabina osteosperma (Torr.) Antoine | Juniperus osteosperma | Cupressaceae
|
| SAPR10 | Sabina prostrata (Pers.) Antoine | Juniperus horizontalis | Cupressaceae
|
| SASC5 | Sabina scopulorum (Sarg.) Rydb. | Juniperus scopulorum | Cupressaceae
|
| SASI11 | Sabina silicicola Small | Juniperus virginiana var. silicicola | Cupressaceae
|
| SAUT3 | Sabina utahensis (Engelm.) Rydb. | Juniperus osteosperma | Cupressaceae
|
| SAVI11 | Sabina virginiana (L.) Antoine | Juniperus virginiana var. virginiana | Cupressaceae
|
| SAFL7 | Sabinea florida (Vahl) DC. | Poitea florida | Fabaceae
|
| SAPU7 | Sabinea punicea Urban | Poitea punicea | Fabaceae
|
| SABR17 | Sabulina brevifolia (Nutt. ex Torr. & Gray) Small | Minuartia uniflora | Caryophyllaceae
|
| SACA33 | Sabulina caroliniana (Walt.) Small | Minuartia caroliniana | Caryophyllaceae
|
| SAGL15 | Sabulina glabra (Michx.) Small | Minuartia glabra | Caryophyllaceae
|
| SAGR18 | Sabulina groenlandica (Retz.) Small | Minuartia groenlandica | Caryophyllaceae
|
| SAPA28 | Sabulina patula (Michx.) Small | Minuartia patula | Caryophyllaceae
|
| SAST13 | Sabulina stricta (Michx.) Small | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| SAUN6 | Sabulina uniflora (Walt.) Small | Minuartia uniflora | Caryophyllaceae
|
| SAUN5 | Sabulina uniflora auct. non (Walt.) Small | Minuartia godfreyi | Caryophyllaceae
|
| SABA13 | Saccharodendron barbatum (Michx.) Nieuwl. | Acer barbatum | Aceraceae
|
| SAFL8 | Saccharodendron floridanum (Chapman) Nieuwl. | Acer barbatum | Aceraceae
|
| SAGR17 | Saccharodendron grandidentatum (Nutt.) Nieuwl. | Acer grandidentatum var. grandidentatum | Aceraceae
|