Fl. Brit. md. 6: 252 (1892); Holttum, Gard. Bull. Singapore 13: 82 (1950); R.M. Sm., Notes R. Bot. Gard. Edinb. 44: 207-210. 1987.
Low herbs; rhizome creeping. Leaf blade asymmetric, often purple on lower side. Inflorescence congested or lax, from ovoid to elongate, terminal, arising in the center of a tuft of few, radical leaves; bracts densely imbricate or spaced along the axis, usually each subtending several flowers; bracteole open to the base and entire; flowers white with red or yellow marks; calyx tubular, split down 1 side; corolla funnel-shaped, tube narrow, much longer than the bracts; lateral staminodes broader than petals, petaloid, spreading; labellum conspicuous and pendulous, spathulate to obovate, 2-lobed or entire; filament broad, short, anther crest 3-lobed or entire, thecae with very short basal spurs; ovary 1-locular. Capsule subglobose, dehiscence unknown; seeds with white, lacerate aril. 2n = 26, 28. (From Kubitzki, et al., p. 485)
Endemic to the Malay Peninsula from S. Thailand southwards to Singapore.
Comprises about 30 species.
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