Crotalaria shanica Lace (1914: 378)

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

39. Crotalaria shanica Lace (1914: 378) . Type:— MYANMAR. Shan State: “ Upper Burma, Gokteik ,” 2,100 feet, 7

October 1911, Lace 5447 (holotype K000591126 !, isotype E00288829 !) .

= Crotalaria shanica var. angusta Craib (1931: 374) . Type (lectotype designated here):— THAILAND. Chiang Mai: 29 October 1922, Kerr 6484 (lectotype BK257993 , isolectotype ABD2 /191!, BM000900989 !).

Herb, erect, 0.7–1.5 m high; young branches terete, white puberulous. Leaves digitately 3-foliolate. Stipules narrowly linear, 1–2 mm long, white puberulous, persistent. Petioles 4–5.8 cm long, white puberulous. Petiolules 0.8–1.5 mm long. Leaflets broadly elliptic or obovate, 1.5–8.5 × 0.5–3.5 cm, base cuneate, apex acute or attenuate, margin entire, glabrous upper, white puberulous lower; lateral veins 6–7 pairs. Inflorescences axillary or leaf-opposed, open racemes, 3.5–18.5 cm long; peduncle 2–4 cm long, white puberulous. Bracts narrowly linear, 0.8–1 mm long, caducous. Pedicels 3–5 mm long, brown pubescent. Bracteoles inserted in the middle of the pedicel, narrowly linear, 0.2–0.3 mm long, caducous. Calyx 4–7 mm long, campanulate, bilabiate; tube 0.5–2 mm long; lobes triangular, 3.5–5 mm long, glabrous inside, white puberulous outside. Corolla yellow. Standard: claw 1–1.5 mm long, white tomentose above and along the margin, glabrous below; blade broadly ovate, 12–13 × 8–10 mm, base obtuse or rounded, apex rounded, margin white puberulous. Wings: claw 1–1.5 mm long, glabrous; blade oblanceolate, 7.5–8 × 3–4 mm, base oblique, apex rounded, margin white puberulous. Keel: claw 1–1.2 mm long, glabrous, margin white puberulous; blade broadly ovate, 8–9 × 5–6 mm, beak spirally twisted, base oblique, apex attenuate, margin white puberulous. Stamens: filaments fused for proximal 2.5–4.5 mm, free for distal 2.5–4.5 mm; anthers either narrowly linear, 0.5–0.8 mm long or oblong, 1–1.2 mm long. Ovary sessile, oblong, 3–3.5 mm long, glabrous; style 6–6.5 mm long, adaxially white puberulous in a single line along the distal edge, abaxially glabrous. Pods sessile, oblong, 2.5–3 × 0.5–0.6 cm, brown, glabrous. Seeds reniform, 1.8–2 × 1–1.2 mm, brown-red.

Representative specimens: — THAILAND. Chiang Mai: Doi Chiang Dao Wildlife Sanctuary , 12 October 1926, Put 301 ( BK) . Chom Thong , 30 September 1991, Maxwell 91-797 ( AAU) . Mae Hong Son: Ban Nam Kat , 20 October 1979, Shimizu et al. T-20064 ( BKF) . Nakhon Sawan: Mae Wong National Park , 21 October 1998, Bult 159 ( CMUB) .

Distribution: —Asia ( Myanmar, Thailand). ( Figure 24 ).

Ecology: —Dry limestone in deciduous dipterocarp forests, elevation 450– 900 m.

Notes: — Crotalaria shanica is distinguished by its broadly elliptic or obovate digitately 3-foliolate leaves, narrowly linear stipules, axillary or leaf-opposed inflorescences, spirally twisted beaks, sessile ovary and glabrous pods.

Figures

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