| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SESP4 | Senecio sphaerocephalus Greene | ballhead ragwort | Asteraceae
|
| SESQ | Senecio squalidus L. | oxford ragwort | Asteraceae
|
| SESTB | Senecio streptanthifolius Greene var. borealis (Torr. & Gray) J.F. Bain | Packera streptanthifolia | Asteraceae
|
| SESTK | Senecio streptanthifolius Greene var. kluanei J.F. Bain | Packera streptanthifolia | Asteraceae
|
| SESTL | Senecio streptanthifolius Greene var. laetiflorus (Greene) J.F. Bain | Packera streptanthifolia | Asteraceae
|
| SESTM2 | Senecio streptanthifolius Greene var. moresbiensis (Calder & Taylor) Boivin | Senecio moresbiensis | Asteraceae
|
| SESTO | Senecio streptanthifolius Greene var. oodes (Rydb.) J.F. Bain | Packera streptanthifolia | Asteraceae
|
| SESTR | Senecio streptanthifolius Greene var. rubricaulis (Greene) J.F. Bain | Packera streptanthifolia | Asteraceae
|
| SESTW | Senecio streptanthifolius Greene var. wallowensis J.F. Bain | Packera streptanthifolia | Asteraceae
|
| SEST3 | Senecio streptanthifolius Greene | Packera streptanthifolia | Asteraceae
|
| SEST6 | Senecio stygius Greene | Packera multilobata | Asteraceae
|
| SESU6 | Senecio subcuneatus Rydb. | Packera streptanthifolia | Asteraceae
|
| SESU5 | Senecio subnudus DC. | Packera cymbalarioides | Asteraceae
|
| SESU8 | Senecio suksdorfii Greenm. | Packera streptanthifolia | Asteraceae
|
| SESY | Senecio sylvaticus L. | woodland ragwort | Asteraceae
|
| SETA2 | Senecio tampicanus DC. | Packera tampicana | Asteraceae
|
| SETA | Senecio taraxacoides (Gray) Greene | dandelion ragwort | Asteraceae
|
| SETH | Senecio thornberi Greenm. | Packera multilobata | Asteraceae
|
| SETH2 | Senecio thurberi Gray | Packera neomexicana var. neomexicana | Asteraceae
|
| SETI | Senecio tichomirovii auct. non Schischkin | Tephroseris kjellmanii | Asteraceae
|
| SETO6 | Senecio toiyabensis Welsh & Goodrich | Senecio spartioides var. spartioides | Asteraceae
|
| SETO2 | Senecio tomentosus Michx. | Packera tomentosa | Asteraceae
|
| SETO8 | Senecio toumeyi Greene | Packera neomexicana var. toumeyi | Asteraceae
|
| SETRA | Senecio triangularis Hook. var. angustifolius G.N. Jones | Senecio triangularis | Asteraceae
|
| SETR | Senecio triangularis Hook. | arrowleaf ragwort | Asteraceae
|
| SETR2 | Senecio tridenticulatus Rydb. | Packera tridenticulata | Asteraceae
|
| SETU | Senecio tundricola auct. non Tolm. | Tephroseris lindstroemii | Asteraceae
|
| SETW | Senecio tweedyi Rydb. | Packera paupercula | Asteraceae
|
| SEUI | Senecio uintahensis (A. Nels.) Greenm. | Packera multilobata | Asteraceae
|
| SEVA3 | Senecio valerianifolius Link ex Spreng. | Erechtites valerianifolia | Asteraceae
|
| SEVA2 | Senecio vaseyi Greenm. | Senecio integerrimus var. exaltatus | Asteraceae
|
| SEVI2 | Senecio viscosus L. | sticky ragwort | Asteraceae
|
| SEVU | Senecio vulgaris L. | old-man-in-the-Spring | Asteraceae
|
| SEWA4 | Senecio wardii Greene | Packera streptanthifolia | Asteraceae
|
| SEWA3 | Senecio warnockii Shinners | Warnock's ragwort | Asteraceae
|
| SEWE5 | Senecio websteri Greenm., non Hook. f. | Senecio neowebsteri | Asteraceae
|
| SEWEA | Senecio werneriifolius (Gray) Gray var. alpinus (Gray) Dorn | Packera porteri | Asteraceae
|
| SEWEI | Senecio werneriifolius (Gray) Gray var. incertus Greenm. | Packera werneriifolia | Asteraceae
|
| SEWE2 | Senecio werneriifolius (Gray) Gray | Packera werneriifolia | Asteraceae
|
| SEWO | Senecio wootonii Greene | Wooton's ragwort | Asteraceae
|
| SEWR3 | Senecio wrightii Greenm. | Packera cynthioides | Asteraceae
|
| SEYU | Senecio yukonensis Porsild | Tephroseris yukonensis | Asteraceae
|
| SENEC | Senecio L. | ragwort | Asteraceae
|
| SECI3 | Senecioides cinerea (L.) Kuntze ex Britt. & Wilson | Cyanthillium cinereum | Asteraceae
|
| SEWE4 | Senegalia westiana (DC.) Britt. & Rose | Acacia retusa | Fabaceae
|
| SECO15 | Senkenbergia coulteri Hook. f. | Boerhavia coulteri | Nyctaginaceae
|
| SEAL4 | Senna alata (L.) Roxb. | emperor's candlesticks | Fabaceae
|
| SEAL5 | Senna alexandrina P. Mill. | Alexandrian senna | Fabaceae
|
| SEAN6 | Senna angustifolia (Vahl) Batka | Senna alexandrina | Fabaceae
|
| SEAR8 | Senna armata (S. Wats.) Irwin & Barneby | desertsenna | Fabaceae
|
| SEAR13 | Senna artemisioides (Gaud. ex DC.) Randell | silver senna | Fabaceae
|
| SEAT3 | Senna atomaria (L.) Irwin & Barneby | flor de San Jose | Fabaceae
|
| SEBA2 | Senna bacillaris (L. f.) Irwin & Barneby | whitebark senna | Fabaceae
|
| SEBA3 | Senna bauhinioides (Gray) Irwin & Barneby | twinleaf senna | Fabaceae
|
| SEBI5 | Senna bicapsularis (L.) Roxb. | Christmasbush | Fabaceae
|
| SECO17 | Senna candolleana (Vogel) H.S. Irwin & Barneby | | Fabaceae
|
| SECO9 | Senna corymbosa (Lam.) Irwin & Barneby | Argentine senna | Fabaceae
|
| SECO10 | Senna covesii (Gray) Irwin & Barneby | Coves' cassia | Fabaceae
|
| SEDI8 | Senna didymobotrya (Fresen.) Irwin & Barneby | African senna | Fabaceae
|
| SEDUI | Senna durangensis (Rose) Irwin & Barneby var. iselyi (Irwin & Barneby) Irwin & Barneby | Isely's senna | Fabaceae
|
| SEDU | Senna durangensis (Rose) Irwin & Barneby | Durango senna | Fabaceae
|
| SEFL4 | Senna �floribunda (Cav.) Irwin & Barneby | | Fabaceae
|
| SEGA2 | Senna gaudichaudii (Hook. & Arn.) Irwin & Barneby | Gaudichaud's senna | Fabaceae
|
| SEHEL | Senna hebecarpa (Fern.) Irwin & Barneby var. longipila (E.L. Braun) C.F. Reed | Senna hebecarpa | Fabaceae
|
| SEHE3 | Senna hebecarpa (Fern.) Irwin & Barneby | American senna | Fabaceae
|
| SEHIG | Senna hirsuta (L.) Irwin & Barneby var. glaberrima (M.E. Jones) Irwin & Barneby | woolly senna | Fabaceae
|
| SEHIH | Senna hirsuta (L.) Irwin & Barneby var. hirsuta | woolly senna | Fabaceae
|
| SEHI2 | Senna hirsuta (L.) Irwin & Barneby | woolly senna | Fabaceae
|
| SEIT2 | Senna italica P. Mill. | Port Royal senna | Fabaceae
|
| SELI9 | Senna ligustrina (L.) Irwin & Barneby | privet senna | Fabaceae
|
| SELI4 | Senna lindheimeriana (Scheele) Irwin & Barneby | velvet leaf senna | Fabaceae
|
| SEMA11 | Senna marilandica (L.) Link | Maryland senna | Fabaceae
|
| SEMEC | Senna mexicana (Jacq.) Irwin & Barneby var. chapmanii (Isely) Irwin & Barneby | Chapman's senna | Fabaceae
|
| SEME4 | Senna mexicana (Jacq.) Irwin & Barneby | Mexican senna | Fabaceae
|
| SEMO11 | Senna monozyx (Irwin & Barneby) Irwin & Barneby | Andean senna | Fabaceae
|
| SEMU5 | Senna multijuga (L.C. Rich.) Irwin & Barneby | false sicklepod | Fabaceae
|
| SENI3 | Senna nitida (L.C. Rich.) Irwin & Barneby | hediondilla | Fabaceae
|
| SEOB5 | Senna obovata (Colladon) Link | Senna italica | Fabaceae
|
| SEOB4 | Senna obtusifolia (L.) Irwin & Barneby | Java-bean | Fabaceae
|
| SEOC2 | Senna occidentalis (L.) Link | septicweed | Fabaceae
|
| SEOR5 | Senna orcuttii (Britt. & Rose) Irwin & Barneby | Orcutt's senna | Fabaceae
|
| SEPEA | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. advena (Vogel) Irwin & Barneby | valamuerto | Fabaceae
|
| SEPEG | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. glabrata (Vogel) Irwin & Barneby | valamuerto | Fabaceae
|
| SEPES | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. stahlii (Urban) Irwin & Barneby | Stahl's valamuerto | Fabaceae
|
| SEPE4 | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby | valamuerto | Fabaceae
|
| SEPI3 | Senna pilosior (B.L. Robins. ex J.F. Macbr.) Irwin & Barneby | TransPecos senna | Fabaceae
|
| SEPO5 | Senna polyphylla (Jacq.) Irwin & Barneby | retama prieta | Fabaceae
|
| SEPU13 | Senna pumilio (Gray) Irwin & Barneby | dwarf senna | Fabaceae
|
| SERA5 | Senna racemosa (P. Mill.) Irwin & Barneby | limestone senna | Fabaceae
|
| SERI7 | Senna ripleyana (Irwin & Barneby) Irwin & Barneby | Ripley's senna | Fabaceae
|
| SERO8 | Senna roemeriana (Scheele) Irwin & Barneby | twoleaf senna | Fabaceae
|
| SESE13 | Senna septemtrionalis (Viv.) H. Irwin & Barneby | senna | Fabaceae
|
| SESE9 | Senna septentrionalis (Viviani) Irwin & Barneby | hedionda macho | Fabaceae
|
| SESI3 | Senna siamea (Lam.) Irwin & Barneby | Siamese cassia | Fabaceae
|
| SESI5 | Senna singueana (Delile) Lock | wild cassia | Fabaceae
|
| SESO2 | Senna sophera (L.) Roxb. | algarrobilla | Fabaceae
|
| SESP9 | Senna spectabilis (DC.) Irwin & Barneby | casia amarilla | Fabaceae
|
| SESU10 | Senna sulfurea (DC. ex Colladon) Irwin & Barneby | smooth senna | Fabaceae
|
| SESU4 | Senna surattensis (Burm. f.) Irwin & Barneby | glossy shower | Fabaceae
|
| SETO4 | Senna tora (L.) Roxb. | sickle senna | Fabaceae
|
| SEUN3 | Senna uniflora (P. Mill.) Irwin & Barneby | oneleaf senna | Fabaceae
|