Crotalaria neriifolia Wallich ex Bentham (1843: 560)

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

29. Crotalaria neriifolia Wallich ex Bentham (1843: 560) . Type (lectotype designated here):— MYANMAR. Tong Dong: 25 January 1862, Wallich 5362 (lectotype K-W K001120677 !, isolectotypes K000591096 !).

Herb, erect, 0.8–1.5 m high; young branches angular, glabrous. Leaves simple. Stipules narrowly linear, 0.5–1 mm long, caducous. Petioles 2–4 mm long, white puberulous. Lamina oblong or linear, 1.7–15.5 × 0.3–1.5 cm, base obtuse or cuneate, apex acute, margin entire, both surfaces glabrous; lateral veins 5–10 pairs. Inflorescences terminal, open racemes, 9–30 cm long; peduncle 1.3–2 cm long, glabrous. Bracts narrowly linear, 1–3 mm long, persistent. Pedicels 1–1.4 cm long, with arachnoid pubescence. Bracteoles inserted in the middle of the pedicel, rarely distally, narrowly linear, 0.3–1 mm long, caducous. Calyx 1–1.3 cm long, campanulate, bilabiate; tube 2–3 mm long; lobes triangular, 7–10 mm long, both sides glabrous. Corolla yellow. Standard: claw 1–1.5 mm long, glabrous; blade elliptic, 2–2.2 × 1.5–1.7 cm, abaxially with red-brown line along the veins on the outer sides, base truncate, apex rounded, margin glabrous. Wings: claw 1.5–2 mm long, glabrous; blade elliptic, 1–1.1 × 0.5–0.6 cm, base oblique, apex obtuse, margin glabrous. Keel: claw 1.8–2 mm long, glabrous, margin white tomentose; blade ovate, 1.2–1.3 × 0.8–0.9 cm, beak spirally twisted, base truncate white tomentose, apex attenuate, margin glabrous. Stamens: filaments fused for proximal 3–4 mm, free for distal 5–6 mm; anthers either narrowly linear, 3–3.5 mm long or oblong, 1.8–2 mm long. Ovary with 2–2.5 mm long stipe, oblong, 7–8 mm long, brown pubescent; style 11–12 mm long, adaxially white puberulous in a single line along the distal edge, abaxially glabrous. Pods with 3–4 mm long stipe, oblong, 4.5–5 × 0.8–1 cm, brown, puberulous. Seeds reniform, 3.5–3.8 × 2.8–3 mm, brown-black.

Representative specimens: — CAMBODIA. Ratanakiri: Matras 71 ( P) . LAOS: Savannakhet: 23 October 1938, Poilane 28286 ( K, L, P) . MYANMAR. Chin State: along the roadside between Saw and Kanpetlet, Natma Taung National Park , 25 October 2011, Man 87688 ( QBG) . THAILAND. Buriram: 26 November 1976, Phengklai et al. 3459 ( BKF) . Chiang Mai: Hang Dong , 18 October 2008, Watthana 2772 ( QBG) . Chiang Rai: Kuhn Chae , 29 December 1997, Maxwell 97-1528 ( CMUB) . Kalasin: Somdet , 24 October 1975, Sutheesorn & Sangkhachand 3538 ( BK) . Kanchanaburi: Thong Pha Phum , 17 December 2009, Pooma et al. 7443 ( BKF) . Khon Kaen: Phu Wiang National Park , 11 November 2014, Ninkaew 276 ( KKU) . Lampang: Doi Khun Tan National Park , 24 April 1973, Umpai 488 ( BK) . Lamphun: Doi Khun Tan National Park , 29 October 1977, Nasongkhla et al. 273 ( BCU) . Loei: Na Yang Tai , 14 November 2011, Lakoet 206 ( QBG) . Mae Hong Son: Mueang , 23 September 1995, Nanakorn et al. 4670 ( QBG) . Nong Bua Lamphu: 18 November 1963, Pradit 649 ( BK) . Phetchabun: Nam Nao National Park , 16 November 2013, Ninkaew 182 ( KKU) . Sakon Nakhon: Phu Phan National Park, Tham Seri Thai , 12 November 2013, Ninkaew 288 ( KKU) . Tak: Doi Hua Mot , 9 August 2014, Ninkaew 277 ( KKU) .

Distribution: —Asia ( Myanmar, Thailand, Laos, Cambodia). ( Figure 18 ).

Ecology: —Roadsides and open places in deciduous dipterocarp forests, elevation 160–1040 m.

Notes: —The diagnostic characters of C. neriifolia are the red-brown lines along the veins on the outer sides of the standard, the oblong pods that are brown puberulous and the glabrous leaves, peduncle, calyx and keel. There are three duplicates of Wallich 5362 of which one is chosen as the lectotype here.

Figures

FIGURE 18. Distribution map of Crotalaria nana and C. neriifolia in continental Southeast Asia.