, Plants of the World Online accepted the following species of Senna:

A

Senna acanthoclada (Griseb.) H.S.Irwin & Barneby (Argentina) Senna acatlanensis C.Rojas-Mart. & A.Delgado (Mexico) Senna acclinis (F.Muell.) Randell – rainforest cassia, brush senna (New South Wales) Senna aciphylla (Benth. ex A.Gray) Randell – sprawling senna, Australian senna (eastern Australia) Senna aculeata (Pohl ex Benth.) H.S.Irwin & Barneby (South America) Senna acunae (Borhidi) A.Barreto & Yakovlev (Cuba) Senna acuparata H.S.Irwin & Barneby (Ecuador, Peru) Senna acuruensis (Benth.) H.S.Irwin & Barneby (Brazil) Senna acutisepala (Benth.) H.S.Irwin & Barneby (Brazil) Senna affinis (Benth.) H.S.Irwin & Barneby (Bolivia, Brazil) Senna alata (L.) Roxb. – candlebush, Christmas candle (South America, Central America) Senna alexandrina Mill. – Alexandrian senna (North Africa, India, Pakistan) Senna andrieuxii (Benth.) H.S.Irwin & Barneby (Mexico) Senna angulata (Vogel) H.S.Irwin & Barneby (Brazil) Senna angustisiliqua (Lam.) H.S.Irwin & Barneby (Caribbean Islands) Senna ankaranensis Du Puy & R.Rabev. (Madagascar) Senna anthoxantha (Capuron) Du Puy (Madagascar) Senna aphylla (Cav.) H.S.Irwin & Barneby (Argentina) Senna apiculata (M.Martens & Galeotti) H.S.Irwin & Barneby (Mexico, Argentina) Senna appendiculata (Vogel) Wiersema (Brazil) Senna apsidoneura (H.S.Irwin & Barneby) H.S.Irwin & Barneby (Bolivia) Senna araucarietorum H.S.Irwin & Barneby (Brazil) Senna argentea (Kunth) H.S.Irwin & Barneby (Mexico) Senna arida (Rose) H.S.Irwin & Barneby (Mexico) Senna aristeguietae H.S.Irwin & Barneby (Brazil, Venezuela) Senna armata (S.Watson) H.S.Irwin & Barneby (Arizona, California, Mexico Northwest, Nevada) Senna arnottiana (Gillies) H.S.Irwin & Barneby (Argentina, Chile) Senna artemisioides (Gaudich. ex DC.) Randell – silver cassia (Australia) Senna atomaria (L.) H.S.Irwin & Barneby (Mexico to Venezuela, Caribbean) Senna aurantia (Ruiz & Pav. ex G.Don) H.S.Irwin & Barneby (Peru) Senna auriculata (L.) Roxb. – avaram, Matara-tea, tanner's cassia (Indian subcontinent, Myanmar) Senna aversiflora (Herb.) H.S.Irwin & Barneby (Brazil) Senna aymara H.S.Irwin & Barneby (Bolivia)

B

Senna baccarinii (Chiov.) Lock Senna bacillaris (L.f.) H.S.Irwin & Barneby – West Indian showertree Senna bahiensis A.G.Lima & V.C.Souza Senna barclayana (Sweet) Randell – smooth senna, pepper-leaf senna (eastern Australia) Senna barnebyana Lass. Senna barronfieldii (Colla) Hewson – southern cassia (eastern Australia) Senna bauhinioides (A.Gray) H.S.Irwin & Barneby Senna benitoensis (Britton & P.Wilson) H.S.Irwin & Barneby Senna bicapsularis (L.) Roxb. – rambling senna, Christmas bush, money bush, yellow candlewood Senna biglandularis A.O.Araujo & V.C.Souza Senna birostris (Dombey ex Vogel) H.S.Irwin & Barneby Senna bosseri Du Puy & R.Rabev. Senna bracteosa D.B.O.S.Cardoso & L.P.Queiroz Senna brongniartii (Gaudich.) H.S.Irwin & Barneby Senna burkartiana (Villa) H.S.Irwin & Barneby

C

Senna cajamarcae H.S.Irwin & Barneby Senna cana (Nees & Mart.) H.S.Irwin & Barneby Senna candolleana (Vogel) H.S.Irwin & Barneby Senna cardiosperma (F.Muell.) Randell (western Australia) Senna catingae (Harms) L.P.Queiroz Senna caudata (Standl.) H.S.Irwin & Barneby Senna cearensis Afr.Fern. Senna centranthera H.S.Irwin & Barneby Senna cernua (Balb.) H.S.Irwin & Barneby Senna charlesiana (Symon) Randell (Western Australia) Senna chloroclada (Harms) H.S.Irwin & Barneby Senna chrysocarpa (Desv.) H.S.Irwin & Barneby Senna circinnata (Benth.) Randell – coiled senna (eastern Australia) Senna cladophylla (W.Fitzg.) Randell (northern Australia) Senna clavigera (Domin) Randell – pepper leaf senna (eastern Australia) Senna cobanensis (Britton) H.S.Irwin & Barneby Senna coimbrae M.Nee & Barneby Senna collicola H.S.Irwin & Barneby Senna confinis (Greene) H.S.Irwin & Barneby Senna corifolia (Benth.) H.S.Irwin & Barneby Senna cornigera H.S.Irwin & Barneby Senna coronilloides (Benth.) Randell – brigalow senna (eastern Australia) Senna corymbosa (Lam.) H.S.Irwin & Barneby – Argentine senna, Argentine wild sensitive plant Senna costata (J.F.Bailey & C.T.White) Randell (northern Australia) Senna covesii (A.Gray) H.S.Irwin & Barneby – Coues' cassia, Coves' cassia, desert senna Senna crassiramea (Benth.) H.S.Irwin & Barneby Senna crotalarioides (Kunth) H.S.Irwin & Barneby Senna cruckshanksii (Hook. & Arn.) H.S.Irwin & Barneby Senna cuatrecasasii H.S.Irwin & Barneby Senna cumingii (Hook. & Arn.) H.S.Irwin & Barneby Senna curvistyla (J.M.Black) Randell (north-western Australia) Senna cushina (J.F.Macbr.) H.S.Irwin & Barneby Senna cuthbertsonii (F.Muell.) Randell (northern Western Australia)

D

Senna dardanoi Afr.Fern. & P.Bezerra Senna dariensis (Britton & Rose) H.S.Irwin & Barneby Senna davidsonii (V.Singh) V.Singh Senna demissa (Rose) H.S.Irwin & Barneby Senna didymobotrya (Fresen.) H.S.Irwin & Barneby – candelabra-tree, peanut butter cassia, African senna Senna divaricata (Nees & Blume) Lock Senna divaricata (Nees & Blume) Lock Senna domingensis (Spreng.) H.S.Irwin & Barneby Senna dryadica A.G.Lima & Mansano Senna durangensis (Rose) H.S.Irwin & Barneby

E

Senna ellisiae (Brenan) Lock

F

Senna ferraria (Symon) Randell (north-western Western Australia) Senna flexuosa (Randell) Randell (Western Australia) Senna × floribunda (Cav.) H.S.Irwin & Barneby Senna foetidissima (Ruiz & Pav. ex G.Don) H.S.Irwin & Barneby Senna formosa H.S.Irwin & Barneby Senna franciscana A.G.Lima & Mansano Senna fruticosa (Mill.) H.S.Irwin & Barneby

G

Senna galeottiana (M.Martens) H.S.Irwin & Barneby Senna gardneri (Benth.) H.S.Irwin & Barneby Senna garrettiana (Craib) H.S.Irwin & Barneby Senna gaudichaudii (Hook. & Arn.) H.S.Irwin & Barneby – climbing cassia, heuhiuhi (Pacific Islands, Queensland) Senna georgica H.S.Irwin & Barneby Senna glaucifolia (Randell) Randell (north-western Australia) Senna gloriosa (H.S.Irwin & Barneby) A.G.Lima & Mansano Senna glutinosa (DC.) Randell (Australia) Senna goniodes (A.Cunn. ex Benth.) Randell (northern Western Australia) Senna gossweileri (Baker f.) Lock Senna guatemalensis (Donn.Sm.) H.S.Irwin & Barneby Senna gundlachii (Urb.) H.S.Irwin & Barneby

H

Senna hamersleyensis (Symon) Randell – creeping senna (northern Western Australia) Senna harleyi H.S.Irwin & Barneby Senna haughtii (J.F.Macbr.) H.S.Irwin & Barneby Senna hayesiana (Britton & Rose) H.S.Irwin & Barneby Senna hebecarpa (Fernald) H.S.Irwin & Barneby – American senna, wild senna Senna heptanthera Randell (Arnhem Land) Senna herzogii (Harms) H.S.Irwin & Barneby Senna hilariana (Benth.) H.S.Irwin & Barneby Senna hirsuta (L.) H.S.Irwin & Barneby – woolly senna (native to Americas, introduced elsewhere) Senna holosericea (Fresen.) Greuter Senna holwayana (Rose) H.S.Irwin & Barneby Senna hookeriana Batke Senna huancabambae (Harms) H.S.Irwin & Barneby Senna huidobriana (Phil.) Zoellner & San Martin Senna huilana (Britton & Rose) H.S.Irwin & Barneby Senna humifusa (Brenan) Lock

I

Senna incarnata (Pav. ex Benth.) H.S.Irwin & Barneby Senna insularis (Britton & Rose) H.S.Irwin & Barneby Senna intermedia (B.D.Sharma, Vivek. & Rathakr.) V.Singh Senna italica Mill. – Port Royal senna, dog senna, Italian senna, Spanish senna Senna itatiaiae H.S.Irwin & Barneby

J

Senna juchitanensis Saynes & R.Torres

K

Senna koelziana H.S.Irwin & Barneby Senna kuhlmannii Hoehne Senna kurtzii (Harms) H.S.Irwin & Barneby

L

Senna lactea (Vatke) Du Puy Senna lasseigniana H.S.Irwin & Barneby Senna latifolia (G.Mey.) H.S.Irwin & Barneby Senna leandrii (Ghesq.) Du Puy Senna lechriosperma H.S.Irwin & Barneby Senna leiophylla (Vogel) H.S.Irwin & Barneby Senna leptoclada (Benth.) Randell (Northern Territory) Senna ligustrina (L.) H.S.Irwin & Barneby – privet senna Senna lindheimeriana (Scheele) H.S.Irwin & Barneby – velvet-leaf senna, showy senna Senna longiglandulosa (Benth.) H.S.Irwin & Barneby Senna longiracemosa (Vatke) Lock Senna loretensis (Killip & J.F.Macbr.) H.S.Irwin & Barneby Senna lourteigiana H.S.Irwin & Barneby

M

Senna macranthera (DC. ex Collad.) H.S.Irwin & Barneby Senna macrophylla (Kunth) H.S.Irwin & Barneby Senna magnifolia (F.Muell.) Randell (Western Australia) Senna malaspinae H.S.Irwin & Barneby Senna mandonii (Benth.) H.S.Irwin & Barneby Senna manicula (Symon) Randell (Western Australia) Senna marilandica (L.) Link Senna martiana (Benth.) H.S.Irwin & Barneby Senna mensicola (H.S.Irwin & Barneby) H.S.Irwin & Barneby Senna meridionalis (R.Vig.) Du Puy – Madagascar senna Senna mexicana (Jacq.) H.S.Irwin & Barneby – Mexican senna Senna mollissima (Humb. & Bonpl. ex Willd.) H.S.Irwin & Barneby Senna monilifera H.S.Irwin & Barneby Senna monozyx (H.S.Irwin & Barneby) H.S.Irwin & Barneby Senna montana (B.Heyne ex Roth) V.Singh Senna morongii (Britton) H.S.Irwin & Barneby Senna mucronifera (Mart. ex Benth.) H.S.Irwin & Barneby Senna multifoliolata (Paul G.Wilson) H.S.Irwin & Barneby Senna multiglandulosa (Jacq.) H.S.Irwin & Barneby – glandular senna, downy senna (Central and Southern America, introduced elsewhere) Senna multijuga (Rich.) H.S.Irwin & Barneby – November shower, false sicklepod (Central and Southern America, introduced elsewhere) Senna mutisiana (Kunth) H.S.Irwin & Barneby

N

Senna nana (Benth.) H.S.Irwin & Barneby Senna neglecta (Vogel) H.S.Irwin & Barneby Senna nicaraguensis (Benth.) H.S.Irwin & Barneby Senna nitida (Rich.) H.S.Irwin & Barneby Senna notabilis (F.Muell.) Randell – cockroach bush (Australia) Senna nudicaulis (Burkart) H.S.Irwin & Barneby

O

Senna obliqua (G.Don) H.S.Irwin & Barneby (Peru) Senna oblongifolia (Vogel) H.S.Irwin & Barneby Senna obtusifolia (L.) H.S.Irwin & Barneby – coffee-weed, java-bean, American sicklepod (Central and Southern America, introduced elsewhere) Senna occidentalis (L.) Link – coffee senna, styptic weed, septicweed (U.S.A., Central and Southern America, introduced elsewhere) Senna oligoclada (F.Muell.) Randell (Northern Australia) Senna orcuttii (Britton & Rose) H.S.Irwin & Barneby – Orcutt's senna Senna organensis (Glaz. ex Harms) H.S.Irwin & Barneby Senna oxyphylla (Kunth) H.S.Irwin & Barneby

P

Senna pachyrrhiza (L.Bravo) H.S.Irwin & Barneby Senna pallida (Vahl) H.S.Irwin & Barneby Senna papillosa (Britton & Rose) H.S.Irwin & Barneby Senna paposana (Phil.) Zoellner & San Martin Senna paradictyon (Vogel) H.S.Irwin & Barneby Senna paraensis (Ducke) H.S.Irwin & Barneby Senna pendula (Humb. & Bonpl. ex Willd.) H.S.Irwin & Barneby – Easter cassia Senna pentagonia (Mill.) H.S.Irwin & Barneby Senna peralteana (Kunth) H.S.Irwin & Barneby Senna perrieri (R.Vig.) Du Puy Senna petersiana (Bolle) Lock Senna phlebadenia H.S.Irwin & Barneby Senna phyllodinea (R.Br.) Symon (arid areas of Australia) Senna pilifera (Vogel) H.S.Irwin & Barneby Senna pilocarina (Symon) Randell (Western Australia) Senna pilosior (B.L.Rob.) H.S.Irwin & Barneby — Trans-Pecos senna Senna pinheiroi H.S.Irwin & Barneby Senna pistaciifolia (Kunth) H.S.Irwin & Barneby Senna planitiicola (Domin) Randell Senna pleurocarpa (F.Muell.) Randell – stripe-pod cassia Senna pluribracteata F.S.Souto & R.T.Queiroz Senna pneumatica H.S.Irwin & Barneby Senna podocarpa (Guill. & Perr.) Lock Senna polyantha (Collad.) H.S.Irwin & Barneby Senna polyphylla (Jacq.) H.S.Irwin & Barneby Senna praeterita H.S.Irwin & Barneby Senna procumbens Randell Senna pumilio (A.Gray) H.S.Irwin & Barneby – dwarf senna Senna punoensis Lass. Senna purpusii (Brandegee) H.S.Irwin & Barneby

Q

Senna quinquangulata (Rich.) H.S.Irwin & Barneby

R

Senna racemosa (Mill.) H.S.Irwin & Barneby – limestone senna Senna reniformis (G.Don) H.S.Irwin & Barneby Senna reticulata (Willd.) H.S.Irwin & Barneby Senna rigidicaulis (Burkart ex L.Bravo) H.S.Irwin & Barneby Senna ripleyana (H.S.Irwin & Barneby) H.S.Irwin & Barneby – Ripley's senna Senna rizzinii H.S.Irwin & Barneby Senna robiniifolia (Benth.) H.S.Irwin & Barneby Senna roemeriana (Scheele) H.S.Irwin & Barneby – twoleaf senna, Roemer senna