Crotalaria semperflorens Ventenat (1800: 17)

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

37. Crotalaria semperflorens Ventenat (1800: 17) . Type :— INDONESIA. Ventenat s.n. (holotype G seen on

Conservatoire Et Jardin Botaniques Ville De Geneva webpage).

= Crotalaria wallichiana Wight & Arnott (1834: 187) . Type (lectotype designated by Ansari 2008):— INDIA. Tamil Nadu, Nilgiri, Wight 696 (lectotype K000591042!, isolectotypes E00174369!, E00174370!).

Herb, erect, (0.5–) 0.7–1 m high; young branches angular, brown pubescent. Leaves simple. Stipules falcate, 4–15 × 2–12 mm long, persistent. Petioles 1–3 mm long. Lamina elliptic or obovate, 3–6 × 1–2.5 cm, base cuneate, apex acute or obtuse, margin entire, both surfaces glabrous; lateral veins 4–7 pairs. Inflorescences terminal, open racemes, 8–22 cm long; peduncle 3.5–5 cm long, sparsely puberulous. Bracts narrowly linear, 1–3 mm long, caducous. Pedicels 8–12 mm long, brown puberulous. Bracteoles inserted on the pedicel, minute, persistent. Calyx 9–10 mm long, truncate; tube 4–5 mm long; lobes subequal, triangular, ca. 5 mm long, glabrous inside, brown puberulous outside. Corolla yellow. Standard: claw 2–2.5 mm long, white tomentose above and along the margin, glabrous below; blade orbicular, 17–18 × 18–20 mm, base truncate, apex rounded, margin glabrous. Wings: claw 2.5–3 mm long, glabrous; obovate, 16–17 × 8–10 mm, base oblique, apex rounded, margin glabrous. Keel: claw 3–3.5 mm long, glabrous, margin white pubescent; blade ovate, 12–13 × 7–8 mm, beak spirally twisted, base oblique, white pubescent, apex attenuate, margin glabrous. Stamens: filaments fused for proximal 6–7 mm, free for distal 5–8 mm; anthers either narrowly linear, 2–2.5 mm long or oblong, 1–1.2 mm long. Ovary with 1–1.2 mm long stipe, oblong, 5–5.5 mm long, brown pubescent; style 14–15 mm long, adaxially white pubescent in a single line along the distal edge, abaxially glabrous. Pods with 3–4 mm long stipe, elliptic, 3.5–5.5 × 0.4–0.5 mm, brown with brown pubescence. Seeds reniform, 3.5 − 4 × 3 − 3.2 mm, brown.

Representative specimens: — MALAYSIA. Kepong : Selangor, 18 October 1988, Saw FRI36377 ( KEP) . Negeri Sembilan: 28 June 1885, Alvenis 1830 ( SING) . Perak: path to Gunong Hijau , 4 December 1965, Shah & Sidek MS 1099 ( BKF, SING) ; Biroh Hill , 9 September 1977, Lewis 249 ( KEP) .

Distribution: —Asia ( Malaysia). ( Figure 23 ).

Ecology: —Open areas, elevation 28–150 m.

Notes: — Crotalaria semperflorens is recognized by its large yellow corolla,falcate stipules, terminal inflorescences, persistent bracteoles, truncate calyx and pubescent ovary.

Figures

FIGURE 23. Distribution map of Crotalaria semperflorens and C. sessiliflora in continental Southeast Asia.