• Senna P. Miller, 1754
• Senna absus (L.) Roxb. accepted as Chamaecrista absus (L.) H.S. Irwin & Barneby
• Senna acanthoclada (Griseb.) H.S. Irwin & Barneby
• Senna aculeata (Benth.) H.S. Irwin & Barneby
• Senna acuparata H.S. Irwin & Barneby
• Senna acuruensis (Benth.) H.S. Irwin & Barneby
• Senna acuta (Vogel) Zoellner & San Martin
• Senna acutifolia (Delile) Batka accepted as Senna alexandrina Mill.
• Senna acutisepala (Benth.) H.S. Irwin & Barneby
• Senna affinis (Benth.) H.S. Irwin & Barneby
• Senna alata (L.) Roxb.
• Senna alcaparra (Phil.) Zoellner & San Martin
• Senna alexandrina Mill.
• Senna andrieuxii (Benth.) H.S. Irwin & Barneby
• Senna angulata (Vogel) H.S. Irwin & Barneby
• Senna angustifolia (Vahl) Batka accepted as Senna alexandrina Mill.
• Senna angustisiliqua (Lam.) H.S. Irwin & Barneby
• Senna ankaranensis Du Puy & R. Rabev.
• Senna anthoxantha (Capuron) Du Puy & R. Rabev.
• Senna aphylla (Cav.) H.S. Irwin & Barneby
• Senna apiculata (M. Martens & Galeotti) H.S. Irwin & Barneb
• Senna appendiculata (Vogel) Wiersema
• Senna apsidoneura (H.S. Irwin & Barneby) H.S. Irwin & Barneby
• Senna araucarietorum H.S. Irwin & Barneby
• Senna arborescens (Vahl) Roxb. accepted as Senna sulfurea (Collad.) H.S. Irwin & Barneby
• Senna argentea (Kunth) H.S. Irwin & Barneby
• Senna arida (Rose) H.S. Irwin & Barneby
• Senna aristeguietae H.S. Irwin & Barneby
• Senna armata (S. Watson) H.S. Irwin & Barneby
• Senna arnottiana (Hook.) H.S. Irwin & Barneby
• Senna artemisioides Isely
• Senna atomaria (L.) H.S. Irwin & Barneby
• Senna aurantia (G. Don) H.S. Irwin & Barneby
• Senna aurata Roxb. accepted as Senna septemtrionalis (Viv.) H.S. Irwin & Barneby
• Senna auriculata (L.) Roxb.
• Senna australis (Vell.) H.S. Irwin & Barneby accepted as Senna appendiculata (Vogel) Wiersema
• Senna aversiflora (Herbert) H.S. Irwin & Barneby
• Senna aversifolia (Herbert) H.S. Irwin & Barneby
• Senna aymara H.S. Irwin & Barneby
• Senna baccarinii (Chiov.) Lock
• Senna bacillaris (L. f.) H.S. Irwin & Barneby
• Senna barclayana (Sweet) Randell
• Senna barnebyana Lass. accepted as Senna aurantia (G. Don) H.S. Irwin & Barneby
• Senna bauhinioides (A. Gray) H.S. Irwin & Barneby
• Senna benitoensis (Britton & Wilson) H.S. Irwin & Barneby
• Senna bicapsularis (L.) Roxb.
• Senna birostris (Vogel) H.S. Irwin & Barneby
• Senna bosseri Du Puy & R. Rabev.
• Senna brongniartii (Gaudich.) H.S. Irwin & Barneby
• Senna burkartiana (Villa) H.S. Irwin & Barneby
• Senna cajamarcae H.S. Irwin & Barneby
• Senna cana (Nees & Mart.) H.S. Irwin & Barneby
• Senna candolleana (Vogel) H.S. Irwin & Barneby
• Senna caudata (Standl.) H.S. Irwin & Barneby
• Senna centranthera H.S. Irwin & Barneby
• Senna cernua (Balb.) H.S. Irwin & Barneby
• Senna chacoensis (L. Bravo) H.S. Irwin & Barneby
• Senna chloroclada (Harms) H.S. Irwin & Barneby
• Senna chrysocarpa (Desv.) H.S. Irwin & Barneby
• Senna clavigera (Domin) Randell
• Senna cobanensis (Britton & Rose) H.S. Irwin & Barneby
• Senna collicola H.S. Irwin & Barneby
• Senna confinis (Greene) H.S. Irwin & Barneby
• Senna coquimbensis (Vogel) Zoellner & San Martin
• Senna corifolia (Benth.) H.S. Irwin & Barneby
• Senna cornigera H.S. Irwin & Barneby
• Senna corymbosa (Lam.) H.S. Irwin & Barneby
• Senna covesii (A. Gray) H.S. Irwin & Barneby
• Senna crassiramea (Benth.) H.S. Irwin & Barneby
• Senna crotalarioides (Kunth) H.S. Irwin & Barneby
• Senna cruckshanksii (Hook.) H.S. Irwin & Barneby
• Senna cuatrecasasii H.S. Irwin & Barneby
• Senna cumingii (Hook. & Arn.) H.S. Irwin & Barneby
• Senna cushina (J.F. Macbr.) H.S. Irwin & Barneby
• Senna dardanoi Alf. 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
• Senna dimidiata Roxb. accepted as Chamaecrista nomame (Sieber) H. Ohashi
• Senna divaricata (Nees & Blume) Lock
• Senna domingensis (Spreng.) H.S. Irwin & Barneby
• Senna durangensis (Rose) H.S. Irwin & Barneby
• Senna ellisiae (Brenan) Lock
• Senna esculenta Roxb. accepted as Senna sophera (L.) Roxb.
• Senna exigua Roxb. accepted as Chamaecrista absus (L.) H.S. Irwin & Barneby
• Senna fabrisii (L. Bravo) H.S. Irwin & Barneby
• Senna floribunda (Cav.) H.S. Irwin & Barneby
• Senna foetidissima (G. Don) H.S. Irwin & Barneby
• Senna formosa H.S. Irwin & Barneby
• Senna fruticosa (Mill.) H.S. Irwin & Barneby
• Senna galegifolia (Jacq.) H.S. Irwin & Barneby
• 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
• Senna georgica H.S. Irwin & Barneby
• Senna glanduligera (St. John) A.C. Sm. accepted as Senna gaudichaudii (Hook. & Arn.) H.S. Irwin & Barneby
• Senna glauca Roxb. accepted as Senna timoriensis (DC.) H.S. Irwin & Barneby
• Senna gossweileri (Baker f.) Lock