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multilamellata Wilmot-Dear (1991), known from the Philippines, N and E Indian subcontinent and possibly Burma, is distinguished from subsp. hainanensis mainly by its fruit with dense short, spreading indumentum and more numerous, scarcely oblique lamellae, an often much larger and ovate terminal leaflet, inflorescence axis branched near base, upper bracts mostly longer, wings and keel often longer, to 6 cm.

8. Mucuna revoluta Wilmot-Dear, Kew Bull. 47: 222 & Figs 5 & 6K. 1992. Type: Vietnam [Trian, Feb. 1877, Pierre s.n (holotype P!)].— M. interrrupta Gagnep. in H.Lecomte, Fl Indo-Chine 2 : 321. 1916, pro parte (citation of Harmand 272; see notes below);Van Thuan, Fl. Camb. LaosVietnam 17: 38. 1979, pro parte (some citations and part of flower description); Wilmot-Dear, Kew Bull. 3 9: 46. 1984, pro parte (citation of Wang 8065, Figs. 3G &3H & note on red flower colour).—.M. imbricata DC ex Bak. var. bispicata Gagnep. in op. cit 2 : 320. 1916. Types: Vietnam [Delta, Harmand s.n. & Trian, Pierre s.n. (syntypes P!)].— M. nigricans sensu Van Thuan, op. cit 17: 38. 1979, pro parte (citations only, but excluding Loureiro); non (Lour.) Steud.— M. biplicata sensu Van Thuan, op. cit 17: 40. 1979, pro parte (citations and part of description); non Teijsm. & Binnend. ex Kurz. Figs. 1 L–M, 2 K.

Vegetatively very similar to M. stenoplax; stems glabrous or with sparse adpressed, fine hairs. Leaves with terminal leaflet 8–10 by 4–5.5 cm, elliptic or ovate, apex abruptly acuminate, base narrowly rounded; lateral leaflet more markedly asymmetrical with width ratio of abaxial to adaxial 1.75–2:1; hairy (rarely glabrous) both sides; stipels shorter, 2–4 mm. Inflorescences (3–)8–16 cm, unbranched or once–twice branched near base, ultimate branchlets knob-like or sometimes slightly lengthened, evenly distributed in upper of axis; pedicels only 5–10 mm, these and main axis with dense, very short (0.1–0 2 mm), fine, spreading, velvety, light brown pubescence; bracts and bracteoles more sparsely hairy, shape and size widely varying, elliptic or narrowly obovate to linear oblong, (5–)10–17 by (2–)5–7 mm, bracteoles exceeding calyx. Calyx densely hairy like the axis and with irritant red bristles, narrowly cup-shaped, tube ca 8 by 8–10 mm, lobes conspicuous, lowest 8–9 mm, laterals 4–6 mm long, all broadly triangular with an abrupt fine acumen. Corolla dark purple or pinkish-purple with paler keel (rarely white), relative proportions ± as in M. stenoplax but petals often slightly larger, standard up to 3 cm long, wings and keel up to 4.8 cm. Fruit leathery, broadly oblong, sometimes asymmetrical, (1–)2-seeded, margins markedly convex, scarcely or not indented between seeds, 6–9 by 4–4.5 cm, length up to twice width, somewhat laterally flattened, to 2.5 cm thick; surface pubescent like the axis and with abundant irritant bristles, also with 8–12 thick-textured, very obliquely transverse parallel lamellae, these bifurcated at apex (“T shaped” in cross-section) with apical halves up to 5 mm broad and strongly revolute, uniformly interrupted along midline of fruit and not extending into marginal wings; both fruit margins with a pair of strongly inrolled wings ca 4 mm wide. Seeds shiny, red brown with black mottling, very large, 2.5–2.8 by ca 2 cm.

Thailand.— NORTHERN: Chiang Mai [Maxwell 89–532 (GH, L., MO)], Chiang Rai, [Pooladda, Smitinand 1664 (BKF, L)], Lamphun [Maxwell 94–1248 (BKF, GH)]; NORTHEASTERN: Loei; EASTERN: Nakhon Ratchasima; SOUTHEASTERN: Chon Buri, Rayong [Maxwell 94–1200 (BKF, GH)], Chanthaburi, Trat [Ko Kut, Phengklai et al. 13147 (BKF)]; PENINSULAR: Krabi, Nakhon Si Thammarat [Ko Kra, Phengklai et al. 12466 (BKF)].

Distribution.— Throughout much of Cambodia, Laos and Vietnam, extending to SW China (Yunnan).

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