35. Crotalaria quinquefolia Linnaeus (1753: 716). Type:— INDIA. Linnean Herbarium 895/38 (LINN microfiche).

Herb, erect, 0.7–1.5 m high; young branches angular, white pubescent. Leaves digitately (4–)5-foliolate. Stipules narrowly linear, 2–4 mm long, persistent. Petioles 1.5–5.7 cm long, brown pubescent. Petiolules 0.2–1 mm long. Leaflets oblong or oblanceolate, 1.3–9 × 0.3–1.5 cm, base cuneate, apex obtuse or emarginate, margin entire, glabrous upper, silvery pubescent lower; lateral veins 4–10 pairs, inconspicuous. Inflorescences terminal or axillary, open racemes, 4–22 cm long; peduncle 2–10 cm long, silvery pubescent. Bracts deflexed, lanceolate, 8–1.2 × 1.8–2 mm, persistent. Pedicels 7–10 mm long, glabrous. Bracteoles inserted on the pedicel, narrowly linear, 0.5–2 mm long, persistent. Calyx 9–11 mm long, campanulate, bilabiate; tube 5–6 mm long; lobes triangular, 4–5 mm long, glabrous inside, silvery pubescent outside. Corolla yellow. Standard: claw 2–3 mm long, white tomentose above and along the margin, glabrous below; blade obovate, 14–15 × 15–17 mm, base cuneate, apex rounded, margin glabrous. Wings: claw 5–6 mm long, white tomentose at the apex above, glabrous below, margin white puberulous; blade elliptic or ovate, 12–14 × 9.5–10 mm, base oblique, apex obtuse, margin glabrous. Keel: claw 4.5–5 mm long, white tomentose above and along the margin, glabrous below; blade ovate, 10–11 × 8–8.5 mm, beak spirally twisted, base oblique white tomentose, apex attenuate, margin white puberulous. Stamens: filaments fused for proximal 10–13 mm, free for distal 5–8 mm; anthers either narrowly linear, 2–2.5 mm long or oblong, 0.8–1 mm long. Ovary with 3–3.5 mm long stipe, oblong, 6.5–7 mm long, glabrous; style 12–13 mm long, white pubescent in two lines along the distal edge. Pods with 7–10 mm long stipe, oblong, 4.7–5.5 × 1.5–2 cm, brown, glabrous. Seeds reniform, 4–5 × 3–3.5 mm, brown.

Representative specimens: — CAMBODIA. Battambang: Thmor Pouk, 22 October 1927, Poilane 14335 (P). Kampong Cham: November 1921, Evrard 715 (P). LAOS. Bokeo: 19 October 1928, Poilane 16024 (P). Bolikhamsai: Paksan, 24 September 1955, Malahide 84 (SING). Salavan: Kouang Si, October 1928, Poilane 16254 (L, P). MYANMAR. Amarapura (Umerapoora): 1826, Wallich 5429 (K). SINGAPORE. Kranji: 1893, Ridley 515 (SING). Seletar: June 1919, Burkill 4345 (SING). THAILAND. Bangkok: Bang Khen, 28 February 1998, Umpai 54 (BK). Chai Nat: Nakhon Sawan-Chai Nat km. 193, 15 December 1999, Sasirat 154 (QBG). Chon Buri: Bangsean, 15 January 1957, Srisuvanatack 17 (BCU). Loei: Phu Kradueng National Park, 18August 1951, Bunpheng 440 (BKF). Ratchaburi: Chom Bueng, 28 February 1965, Sakol 426 (BK). Sa Kaeo: Aranyaprathet, 16 October 1928, Put 1977 (BK). Saraburi: Mueang, 17 October 1973, Maxwell 73-544A (AAU, BK). Songkhla: Satingpra, 26 November 1983, Sirirugsa 706 (PSU). VIETNAM. Dak Lak: Ban Me Thuot, 21 November 1949, Schmid 718 (P). Lam Dong: Da Lat, 1966, Cuong 1031 (P). Ninh Thuan: Phan Rang-Thap Cham, 16 November 1930, Poilane 18789 (P).

Distribution: —North America, Africa, Asia (India, Sri Lanka, Myanmar, Thailand, Laos, Cambodia, Vietnam, Singapore), Australia. (Figure 21).

Ecology: —Elevation 4–1500 m.

Notes: — Crotalaria quinquefolia is characterized by its oblong or oblanceolate leaflets, lanceolate deflexed bracts, the beak of its keel which is spirally twisted and the glabrous pods.