Volume 4 > Part 3 > Year 2018 > Page 271 > Leguminosae-Papilionoideae > Crotalaria

33. Crotalaria spectabilis Rothwfo-0000210927

Nov. Pl. Sp.: 341. 1821; DC., Prodr. 2: 125. 1825; Niyomdham, Thai Forest Bull., Bot. 11: 155. 1978; Polhill, Fl. Trop. East Africa, Legum. (Part 4): 959. 1971; Grierson & Long, Fl. Bhutan 1(3): 733. 1987; J.Q.Li et al. in Z.Y.Wu et al., Fl. China 10: 110. 2010; Ninkaew et al., Phytotaxa 320(1): 53. 2017. Plate XVI: 3.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Herb or shrublet 0.7–2 m tall, erect; young branches angular, brown pubescent. Stipules triangular, 3–7 by 1–3 mm, silvery pubescent, persistent. Leaves simple, obovate, 5.5–15 by 2–6 cm, apex acute, obtuse or rounded, base cuneate, margin entire, upper surface glabrous, lower surface brown puberulous; lateral veins 5–11 pairs; petioles 3–7 cm long, brown pubescent. Inflorescences terminal, rarely axillary, open racemes, 10–37 cm long; peduncle 1.5–12 cm long, glabrous; bracts cordate or ovate, 5–15 by 3–6 mm, persistent; bracteoles inserted on the pedicel, narrowly linear, 1–2 mm long, caducous; pedicels 1.3–1.5 cm long, glabrous. Calyx 8–10 mm long, campanulate, bilabiate; tube 4–5 mm long; lobes triangular, 4–5 mm long, both sides glabrous. Corolla yellow; standard broadly orbicular, 17–18 by 23–24 mm, apex emarginate, base truncate, margin glabrous, claw 2–2.5 mm long, white tomentose on the upper and along the margin, glabrous on the lower; wings elliptic or ovate, 12–14 by 11–13 mm, apex obtuse or rounded, base oblique, margin glabrous, claw 3–4 mm long, glabrous, margin white puberulous; keel ovate, 9–11 by 7–8 mm, beak twisted, apex attenuate, base oblique white tomentose, margin white tomentose, claw 3–3.2 mm long, white tomentose on the upper and along the margin, glabrous on the lower. 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 stipitate, oblong, 7–8 mm long, glabrous; style 9–10 mm long with dispersed white pubescence; stipe 1–1.5 mm long. Pods oblong, 4–4.5 by 1.3–1.7 cm, brown, glabrous; stipe 2–2.5 mm long. Seeds reniform, 4.5–5 by 3.5–4 mm, brown-black.

Thailand : NORTHERN: Mae Hong Son, Chiang Mai (Mae Taeng, Pa Pae), Chiang Rai (Khun Kon Forest Park), Phayao (Phukamyao Rongpo Village) Lampang (Mae Luang), Phrae; NORTH-EASTERN: Sakon Nakhon (Phu Phan NP); SOUTH-WESTERN: Kanchanaburi (Kroeng Krawia Village – type of Crotalaria spectabilis subsp. parvibracteata: Larsen 9544 -C), Thong Pha Phum, Tha Khanun); SOUTH-EASTERN: Sa Kaeo; PENINSULAR: Chumphon (Sawi), Songkhla (Rattaphum).

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

Ecology : Along roadsides, to 900 m alt.

Vernacular : Ma hing men (มะหิ่งเม่น); rang chuet (รางจืด)(Kanchanaburi).