Exot. Bot. 2: 97 (1806); Spearing, Notes R. Bot. Gard. Edinb. 35: 217-220 (1977); Cowley, Kew Bull. 36: 747-777 (1982), rev.
Low herbs with short rhizome; roots tuberous, fusiform. Leaves with minute ligule, and tubular, closed sheath. Inflorescence a raceme, terminal on the leafy shoot, or on a leafless shoot appearing before the leaves are formed; bracts green, each subtending 1 flower; bracteole absent; flowers purplish to pale blue or white; calyx tubular, split down 1 side; corolla tube slender, as long as or longer than calyx, dorsal petal broad, cucullate; lateral staminodes petaloid, erect, narrowly obovate to circular or rhombic; labellum conspicuous and more or less pendulous, obovate, entire to bifid, shorter than the petals; filament short, anther versatile, basally with 2 long spurs at right angles to the thecae, crest absent; ovary 3-locular. Capsule ellipsoid to cylindrical, tardily dehiscent by 3 valves, or by 1 lateral slit; seeds with white, lacerate, fleshy aril. 2n = 24, 48. (From Kubitsky, et al., p. 484)
Found in mountains from the Himalayan region to southern China and northern Vietnam.
Comprises about 17 species.
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