J. Straits Branch R. Asiat. Soc. 32: 103 (1899); Holttum, Gard. Bull. Singapore 13: 78-82 (1950); R.M. Sm., Notes R. Bot. Gard. Edinb. 31: 205-207 (1972).
Small herbs with slender stems bearing few leaves. Leaves asymmetric. Inflorescence terminal on the leafy shoot, consisting of a single cincinnus in the axil of 1 large, concave bract, margins of bract basally adnate to the inflorescence axis, some times with apical foliaceous appendage; bracteole thin, open to the base and entire; flowers white or lilac; calyx short, funnel-shaped; corolla tube slender, longer than the bracts; lateral staminodes almost circular, spreading; labellum conspicuous and pendulous, bifid; filament short and broad, anther versatile, crest absent, thecae basally spurred; ovary 3-locular. Capsule ellipsoid, dehiscence unknown; seeds with translucent, lacerate aril. (From Kubitzki, et al., p. 483)
Found in southern Thailand, western Malaysia and Sumatra.
Comprises four species.
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