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17. Stems, petioles, leaflets beneath and infructescence axis with orange-brown pubescence giving distinctly yellowish-orange tinge especially to leaflet veins beneath 11b. M. puriens var. hirsuta

17. Stems, leaves and infructescence axis, if pubescent, silvery

11a. M. puriens var. puriens

A. Subgenus Mucuna.

Woody climbers. Leaves with lateral veins usually (in Thailand always) becoming indistinct near margin or running parallel to it, not running clearly into margin. Seeds discoid or reniform, large and strongly laterally flattened with hilum extending around 3/4 of circumference.

1. Mucuna macrocarpaWall., Pl.Asiat. Rar. 1: 41, t.47. 1830; Gagnep. in H.Lecomte, Fl Indo- Chine 2: 317. 1916;Van Thuan, Fl. Camb. LaosVietnam 17: 35. 1979;Wilmot-Dear, Kew Bull. 47: 207 & figs 1 & 7E–F. 1992. Type: Nepal [Wallich 5618 (holotype K!)].— M. collettii Lace, Bull. Misc. Inf. Kew 1915: 398. 1915; Craib, Fl Siam. 1:443. 1925. Types: Burma [Collett 458, Lace 5866 (syntypes K!), Hauxwell s.n., Rogers 19 (syntypes not found)]; China, Yunnan [Henry 11702 (syntype K!; isosyntype A!)]. Figs. 1 Q–R, 2 N–P.

Woody climber up to 70 m; stems and petioles with sparse to dense, light brown or red-brown fine pubescence, sometimes later glabrous. Leaves with wide size range, terminal leaflet (7–)10–19 by (3–) 5–10 mm, elliptic to ovate (or obovate), length/width ratio ca 2:1, apex acute or short-acuminate, base rounded to slightly cuneate, lateral veins (3–)4–6(–7) pairs, curved; lateral leaflets usually markedly asymmetrical, width ratio of abaxial to adaxial halves 2:1, base of abaxial half truncate; thin-chartaceous to thick-coriaceous, young leaflets hairy like the stem, often later glabrous; stipels absent. Inflorescences from old wood, 5–23 cm, main axis unbranched with short (ca 0.3–0.4 mm) often spreading pubescence and fine brownish bristles; ultimate branchlets reduced, knob-like, spaced throughout length; pedicels 8–10 mm,; bracts and bracteoles ovate, bracteoles 2–5 by 1–4 mm, shorter than calyx. Calyx hairy like the axis, tube 8–12 by 12–20 mm, lowest lobe 5–6 (–8) mm, laterals usually half this length, all narrowly or broadly triangular. Corolla large, two-coloured, standard greenish or pinkish white, wings dark purple, keel lighter purple or yellowish green; standard 3–3.8 (–4.5) cm long, just over S keel length, wings rather broad 4–5.5(–6) by ca 1.5 cm, keel distinctly longer 5–6.5 (–7) cm; margin of standard and wings conspicuously pubescent in distal part up to T or length. Fruit woody, greenish, linear- oblong 6–15-seeded with margins often markedly constricted between seeds, 26–45 (–48) by 3–5 cm, markedly laterally flattened, 0.7–1 mm thick, densely pubescent (rarely glabrescent), with irregular longitudinal wrinkles when dry; margins without wings or distinct thickened rim or central groove along suture. Seeds black with dark brown or black hilum, very large, 2.2–3.2 by 1.8–2.8 cm.

Thailand.— NORTHERN: Chiang Mai [Doi Inthanon, Phengklai et al. 6880 (BKF)], Lamphun [Mae Tan, Maxwell 94–164 (BKF, GH)]; NORTHEASTERN: Loei [Phu Kradueng, Niyomdham 2952 (AAU, BKF)]; EASTERN: Chaiyaphum [Nakhon Ratchasima, Khao Yai National Park, Smitinand et al. 8026 (BKF)]; SOUTHWESTERN: Kanchanaburi [Huai Kha Khaeng & Thung Yai Naresuan, Smitinand et al. 383 (BKF)]; CENTRAL: [sterile, identity

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