Crotalaria spectabilis Roth (1821: 341)

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

40. Crotalaria spectabilis Roth (1821: 341) . Type :— INDIA. 1 January 1814, Heyne s.n. (isotype L0018854 !).

= Crotalaria sericea Retzius (1788: 26) nom. illeg. Type:— INDIA. Wallich 1922 (C!).

= Crotalaria spectabilis Roth subsp. parvibracteata Niyomdham (1978: 155) . Type:— THAILAND. Kanchanaburi: Kroeng Kavia village, 4 February 1962, Larsen 9544 (holotype C10012074 !).

Herb or shrublet, erect, 0.7–2 m high; young branches angular, brown pubescent. Leaves simple. Stipules triangular, 3–7 × 1–3 mm, silvery pubescent, persistent. Petioles 3–7 cm long, brown pubescent. Lamina obovate, 5.5–15 × 2–6 cm, base cuneate, apex acute, obtuse or rounded, margin entire, glabrous upper, brown puberulous lower; lateral veins 5–11 pairs. Inflorescences terminal, rarely axillary, open racemes, 10–37 cm long; peduncle 1.5–12 cm long, glabrous. Bracts cordate or ovate, 5–15 × 3–6 mm, persistent. Pedicels 1.3–1.5 cm long, glabrous. Bracteoles inserted on the pedicel, narrowly linear, 1–2 mm long, caducous. Calyx 8–10 mm long, campanulate, bilabiate; tube 4–5 mm long; lobes triangular, 4–5 mm long, both sides glabrous. Corolla yellow. Standard: claw 2–2.5 mm long, white tomentose above and along the margin, glabrous below; blade broadly orbicular, 17–18 × 23–24 mm, base truncate, apex emarginate, margin glabrous. Wings: claw 3–4 mm long, glabrous, margin white puberulous; blade elliptic or ovate, 12–14 × 11–13 mm, base oblique, apex obtuse or rounded, margin glabrous. Keel: claw 3–3.2 mm long, white tomentose above and along the margin, glabrous below; blade ovate, 9–11 × 7–8 mm, beak spirally twisted, base oblique white tomentose, apex attenuate, margin white tomentose. Stamens: filaments fused for proximal 8–9 mm, free for distal 5–9 mm; anthers either narrowly linear, 3–3.8 mm long or oblong, 0.8–1 mm long. Ovary with 1–1.5 mm long stipe, oblong, 7–8 mm long, glabrous; style 9–10 mm long with dispersed white pubescence. Pods with 2–2.5 mm long stipe, oblong, 4–4.5 × 1.3–1.7 cm, brown, glabrous. Seeds reniform, 4.5–5 × 3.5–4 mm, brown-black.

Representative specimens: — LAOS. Oudomxay: Xay , 1 November 2012, Khantheo & Phonesavanh LNT0664 ( HNL) . MALAYSIA. Penang: 1989, Ridley s.n. ( SING) . MYANMAR. Magway: Thi Kung Village , 20 November 2011, Man 87883 ( QBG) . THAILAND. Chiang Mai: Mae Taeng, Pa Pae , 17 September 1995, BGO Staff 4476 ( QBG) . Chiang Rai: Khun Korn Forest Park, 7 December 1997, KK 671 ( BCU) . Chumphon: Sawi , 28 June 2015, Ninkaew

387 ( KKU). Kanchanaburi: Thong Pha Phum , 23 February 1981, Sangkhachand et al. 3204 ( BKF) . Mae Hong Son: Mueang , 15 December 2007, Tanaka et al. HN8394 ( QBG) . Phayao: Phukarmyao Rongpor village , 18 February 2016, Balslev & Bunma 8685 ( AAU, BKF, QBG) . Sa Kaeo: Mueang , 28 February 2014, Ninkaew 271 ( KKU) . Sakon Nakhon: Phu Phan National Park , 12 December 1998, Leeratiwong 98-25 ( PSU) . Songkhla: Rattaphum , 19 August 2013, Madsai 02/2013 ( PSU) . VIETNAM. Thanh Hoa: Quan Hoa, Hang Village , 3 October 2003, Averyanov et al. HAL3878 ( HN) .

Distribution: —North America, Africa, Asia ( India, Bangladesh, Myanmar, China, Thailand, Laos, Vietnam, Malaysia), Australia. ( Figure 24 ).

Ecology: —Roadsides, elevation 6–900 m.

Notes: — Crotalaria spectabilis is similar to both C. assamica and C. retusa , but differs markedly from them by its triangular stipules, glabrous peduncle and calyx, emarginate standard apex and the base of the keel which is white tomentose.

Figures

FIGURE 24. Distribution map of Crotalaria shanica and C. spectabilis in continental Southeast Asia.