Crotalaria bracteata Roxburgh ex Candolle (1825: 130)

Ninkaew, Sakuntala, Balslev, Henrik, Pornpongrungrueng, Pimwadee & Chantaranothai, Pranom, 2017, Crotalaria L. (Fabaceae: Faboideae) in continental Southeast Asia, Phytotaxa 320 (1), pp. 448-450 : 448-450

6. Crotalaria bracteata Roxburgh ex Candolle (1825: 130) . Type :— INDIA. 18 September 1815, Wallich 985 (holotype G00457902 ! seen on image). ( Figure 30E ).

Herb, erect, 0.5–1 m high; young branches terete, brown tomentose. Leaves digitately 3-foliolate. Stipules narrowly linear, ca. 1 mm long, brown pubescent, caducous. Petioles 2.5–5.7 cm long, brown pubescent. Petiolules 1–3 mm long. Leaflets elliptic or obovate, 5–10 × 3–4.5 cm, base cuneate, apex acute or emarginate, margin entire, glabrous upper, white puberulous lower; lateral veins 6–10 pairs. Inflorescences leaf-opposed, open racemes, 5.5–9.5 cm long; peduncle 0.7–2 cm long, brown pubescent. Bracts narrowly linear, 1.3–2 mm long, persistent. Pedicels 2–5 mm long, brown pubescent. Bracteoles inserted on the calyx tube, ovate, 3–3.5 × 1–1.5 mm, persistent. Calyx 3–5 mm long, truncate; tube 1.5–2 mm long; lobes subequal, triangular, 1.5–3 mm long, glabrous inside, white puberulous outside. Corolla yellow (sometimes reddish-yellow). Standard: claw 1.8–2 mm long, glabrous, apex with appendages, margin white pubescent; blade broadly ovate, 8–10 × 7–8 mm, base rounded, apex acute, margin glabrous. Wings: claw 1–2 mm long, glabrous; blade oblong, 7–8 × 3–3.5 mm, base oblique, apex acute, margin glabrous. Keel: claw 1.8–2 mm long, glabrous except margin white pubescent; blade ovate, 11–12 × 4–5 mm, beak not twisted, base cuneate, apex attenuate, margin white puberulous. Stamens: filaments fused for proximal 5–6 mm, free for distal 5–6 mm; anthers either narrowly linear, 1–1.5 mm long or oblong, 0.2–0.3 mm long. Ovary with 0.8–1 mm long stipe, oblong, 2–3 mm long, white tomentose; style 11–12 mm long, adaxially white pubescent at the base and along a single line on the distal edge, abaxially glabrous. Pods with 1.5–2 mm long stipe, elliptic, 1.2–2 × 0.6–0.8 cm, brown, white tomentose. Seeds reniform, 3–3.2 × 2.8–3 mm, yellow-brown.

Representative specimens: — CAMBODIA. Ratanakiri: Banlung , 19 November 1997, Hul & Yok 350 ( P) . Stung Treng: December 1975, Harmand 74 ( BM, P) . LAOS. Luang Prabang: Ban Bo , January 1954, Vidal 2640 ( P) . Savannakhet: 28 December 1924, Poilane 11369 ( BKF, L, P) . Xieng Khouang: 23 November 1920, Poilane 2398 ( AAU, BKF, HN, K, L, P) . MYANMAR. Griffith 1473 ( K) . THAILAND: Chiang Mai: Doi Pha Hom Pok National Park , 22 November 2014, Ninkaew 310 ( KKU) . Chiang Rai: 26 January 1963, Sutheesorn 1538 ( BK) . Chaiyaphum: Phu Khieo , 9 November 1984, Murata et al. T-50416 ( BKF) . Kamphaeng Phet: 9 November 1920, Kerr 4544 ( AAU, BK) . Kanchanaburi: Sai Yok , 5 November 1979, Shimizu et al. T-21735 ( BKF) . Khon Kaen: Phu Pha Man National Park, Pha Nok Khao , 24 December 2011, Norsaengsri & Tathana 8421 ( QBG) . Lampang: 26 December 1921, Winit 654 ( BK) . Lamphun: Doi Khun Tan National Park , 1 November 1994, Maxwell 94-1174 ( BKF) . Loei: Phu Kradueng National Park , 14 October 1953, Bunpheng 678 ( BKF) . Mae Hong Son: Mueang, Ban Huai Sai Khao , 14 March 2001, Pongamornkul 2962 ( QBG) . Nan: Bo Kluea , 21 February 2014, Ninkaew 253 ( KKU) . Phayao: Doi Luang National Park , 19 November 1997, Petrmitr 147 ( CMUB) . Phrae: Mae Yom National Park , 7 November 1991, Maxwell 91- 981 ( CMUB) . Phetchabun: Nam Nao National Park , 5 January 2014, Ninkaew 269 ( KKU) . Phetchaburi: Nong Ya Plong Khao Krating , 3 October 2002, Niyomdham & Puudjaa 6944 ( BKF) . Phitsanulok: Nakhon Thai , 26 December 1966, Prayad 633 ( BK) . Ratchaburi: Chaleam Phrakiat Thai Prachan National Park , 24 October 2014, Ninkaew 334 ( KKU) . Sukhothai: 5 November 1971, Maxwell 71-689 ( AAU) . Tak: Umphang , 7 November 1998, Puudjaa 531 ( BKF) . Uthai Thani: Lan Sak , 12 November 1979, Shimizu et al. T-22248 ( BKF) . Uttaradit: Ban Nam Pad , 29 October 2010, Pongamornkul 2755 ( PSU, QBG) . VIETNAM. Gia Lai: An Khe , 24 December 1977, Thai D 316 ( HNU) . Kon Tum: Dak Glei , 12 November 1995, Averyanov et al. VH1577 ( P) .

Distribution: —Asia ( China, Thailand, Laos, Cambodia, Vietnam). ( Figure 5 ).

Ecology: —Open areas in deciduous dipterocarp, mixed deciduous and dry evergreen forests with bamboo dominance, elevation 65–1300 m.

Notes: —The diagnostic characters of C. bracteata are the white tomentose pods, leaf-opposed inflorescences and glabrous or sparely puberulous leaves.

Figures

FIGURE 5. Distribution map of Crotalaria bracteata in continental Southeast Asia.

FIGURE 30. Crotalaria in continental Southeast Asia: A & B) C. alata; C) C. albida; D) C. assamica; E) C. bracteata; F) C. chinensis; G) C. goreensis; H & I) C. incana; J & K) C. juncea; L) C. medicaginea; M) C. pallida N) C. sessiliflora and O) C. verrucosa.