THAI FOREST BULLETIN (BOTANY) 36
thick-chartaceous, lower surface with silky or ± spreading, usually dense, yellowish-orange hairs, especially along veins which thus appear distinctly orange. Bracts slightly shorter than bracteoles, broadly ovate to 9 by 7 mm and up to twice as long as wide, acute or broadly rounded; bracteoles later caducous than in var. pruriens, narrowly ovate to narrowly elliptic ovate, 5–6(–11) by 2(–3) mm. Corolla purple. Fruit linear, often slightly downcurved at apex, to 1 cm wide, with dense dark brown irritant bristles. Seeds dark red brown; aril and hilum black.
Thailand.— NORTHERN: Chiang Mai [Phengkhlai et al. 6533 (BKF); ibid, Mitsuta et al. 50209 (BKF)]; Phitsanulok; NORTHEASTERN: Khonkaen [Murata et al. 50398 (BKF)] ; EASTERN: Chaiyaphum [Phengkhlai et al. 6116 (slightly intermediate with var. pruriens) (BKF)]; SOUTHWESTERN: Uthai Thani.
Distribution.— Vietnam; India (W. Peninsular). Ecology.— Dense or disturbed forest, clearings and forest edges; 300–1200 m. alt.
Notes.— Only seven collections of this variety have been seen from Thailand (four since 1992, all cited here). It is seldom collected (less than 25 collections have been seen throughout its distribution) and presumably rare. It is distinguished from the typical variety mainly by its long spreading and often crisped (never adpressed), soft, orange hairs on most parts and rounded to acute (rather than acuminate) broader bracts and bracteoles. The few collections seen from Thailand are less distinctly orange-pubescent than those found in India and harder to distinguish unless bracts are present. The rather thick-textured, often densely hairy, leaflets and almost straight fruit are more like those of M. bracteata which is distinguishable by flowers or bract-scars also present in lowest part of inflorescence axis.
11c. var. utilis (Wall. ex Wight) Baker ex Burck.,Ann. Jard. Bot. Buitenzorg 11: 187. 1893;Wilmot-Dear, Kew Bull. 47: 239 & Fig. 10 J. 1992.— M. utilis Wall. exWight, Ic. Pl. Ind. Or. 1: 280. 1840; Gagnep. in H.Lecomte, Fl Indo-Chine 2 : 321. 1916. Type: not indicated. Fig 5J.— M. capitata Wight &Arn., Prod. Fl. Ind. Orient. 1(2): 255. 1834; Gagnep. in op. cit : 322. 1916. Type: Roxburgh drawing no. 285 (lectotype K!).— M. cochinchinensis (Lour.) A. Chev., Bull.Agr. Inst. Sci. Saigon 1: 91. 1919; Merr., Trans.Amer. Phil. Soc. 24: 209. 1935;Van Thuan, Fl. Camb. Laos Vietnam 17: 32. 1979. Type: Vietnam, Cochinchina [Loureiro s.n. (holotype BM!)].
Plant very similar to var. pruriens but irritant bristles completely lacking. Leaves with terminal leaflet relatively broad, length/width ratio rarely over 1.5:1; lateral leaflets often markedly larger than terminal and to 20 cm long. Calyx without red bristles but often with fine long hairs; length of lowest lobe to twice (never 3 x) that of laterals. Corolla purple or white, often rather short, standard up to 1.8 cm, keel to 3.5(–4.5) cm. Fruit linear-oblong, but often misshapen due to irregular sizes of swellings around seeds and sometimes to 2 cm broad in parts; surface with dense or sparse, short, soft, adpressed or spreading, light brown hairs. Seeds very variable in colour, whitish, fawn, orange or black, sometimes marbled in various colours or obliquely dark marked; aril orange.
Thailand.— NORTHERN: Chiang Mai.