Volume 4 > Part 3 > Year 2018 > Page 260 > Leguminosae-Papilionoideae > Crotalaria

20. Crotalaria medicaginea Lam.wfo-0000185077

Encycl. 2(1): 201. 1786; DC., Prodr. 2: 133. 1825; Baker in Hook.f., Fl. Brit. India 2: 81. 1879; Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 45(2): 267. 1876; Trimen, Fl. Ceylon 2: 18. 1894; Gagnep. in Lecomte, Fl. Indo-Chine 2: 345. 1916; Craib, Fl. Siam. 1: 372. 1928; Munk, Reinw. 6: 208. 1962; Niyomdham, Thai Forest Bull., Bot. 11: 140. 1978; Thuân et al., Fl. Cambodge, Laos & Vietnam 23: 237. 1987; Rudd in Dassanayake & Fosberg, Revis. Handb. Fl. Ceylon 7: 208. 1991; J.Q.Li et al. in Z.Y.Wu et al., Fl. China 10: 116. 2010; Ninkaew et al., Phytotaxa 320(1): 35. 2017.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Herb 15–50 cm tall, erect or prostrate; young branches terete, brown pubescent. Stipules narrowly linear, 1–2 mm long, persistent. Leaves digitately 3-foliolate; petioles 1–1.5 cm long, brown pubescent. Leaflets obovate or obcordate, 0.3–1.5 by 0.2–1 cm, apex truncate or emarginate, base cuneate, margin entire, upper surface glabrous, lower surface white pubescent; lateral veins inconspicuous; petiolules 0.1–1 mm long. Inflorescences terminal or axillary, open racemes, 1–3.5 cm long; peduncle 0.3–1.7 cm long, brown pubescent; bracts narrowly linear, 0.5–1 mm long, persistent; bracteoles inserted on middle of the pedicel, narrowly linear, 0.3–0.5 mm long, caducous; pedicels 0.8–2 mm long, brown pubescent. Calyx 2.2–2.5 mm long, campanulate, bilabiate; tube 0.8–1 mm long; lobes triangular, 1.4–1.5 mm long, glabrous inside, brown pubescent outside. Corolla yellow; standard elliptic, 2.3–2.5 by 1.7–1.8 mm, apex obtuse, base truncate, margin glabrous, claw 0.7–0.8 mm long, glabrous; wings oblong, 1.3–1.5 by 0.7–1 mm, apex obtuse, base oblique, margin glabrous, claw 0.4–0.5 mm long, glabrous; keel lanceolate, 2.8–3 by 0.8–1 mm, beak twisted, apex attenuate, base oblique, margin glabrous, claw 0.4–0.5 mm long, glabrous. Stamens: filaments fused for proximal 0.6–0.7 mm, free for distal 1–2.3 mm; anthers either narrowly linear, 0.3–0.5 mm long or oblong, ca 0.1 mm long. Ovary sessile, elliptic, 1–1.2 mm long, brown pubescent; style 2.8–3.5 mm long with dispersed white pubescence. Pods sessile, broadly ovate, 3–5 by 2–4 mm, brown, brown pubescent. Seeds harp-shaped, 1.5–1.7 by 1.7–2 mm, brown-black.

Thailand : NORTHERN: Chiang Mai (Chom Thong, Samoeng), Lamphun (Mae Ping NP), Tak (Umphang); NORTH-EASTERN: Phetchabun (Nam Nao NP), Loei (Phu Kradueng, Chiang Khan), Khon Kaen (Phu Wiang NP, Dong Lan Forest); EASTERN: Nakhon Ratchasima (Bua Yai, Dan Khun Thot), Buri Ram; SOUTH-WESTERN: Kanchanaburi (Chong Sadao, Ban Kao, Sai Yok, Salak Phra, Si Sawat), Ratchaburi, Prachuap Khiri Khan (Sam Roi Yot, Hua Hin, Huai Yang, Ko Tao); SOUTH-EASTERN: Sa Kaeo (Aranyaprathet), Chon Buri (Sattahip, Si Racha, Thung Prong); PENINSULAR: Chumphon (Ko Pitak).

Distribution : N America, Africa, Sri Lanka, India (type), Myanmar, China, Laos, Vietnam, Australia.

Ecology : Open places and disturbed areas in deciduous dipterocarp, mixed deciduous, evergreen forests and limestone mountains, 50–2,000 m alt.

Vernacular : Phak waen ton (ผักแว่นต้น)(Chon Buri).