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.

Published as part of Ninkaew, Sakuntala, Balslev, Henrik, Pornpongrungrueng, Pimwadee & Chantaranothai, Pranom, 2017, Crotalaria L. (Fabaceae: Faboideae) in continental Southeast Asia, pp. 448-450 in Phytotaxa 320 (1) on pages 448-450, DOI: 10.11646/phytotaxa.320.1.1, http://zenodo.org/record/13699110