Terrestrial herbs. Stems decumbent, creeping at base, leafy and erect toward apex. Leaves petioled, membranaceous, ovate or lanceolate. Flowers lateral, in terminal spikes; sepals free, dorsal one smaller, adnate and forming a hood with petals, lateral ones spreading; lip composed of a spurred base and a terminal blade, spur cylindric, exserted beyond bases of lateral sepals, without warts or hairs inside; column stout, not appendaged ventrally; anther erect, terminal on dorsal side of column, 2-celled; pollinia 2, clavate, sectile, attached to a small viscidium; stigma single, ventral; rostellum erect, 2-fid.
About 100 species, widely distributed in China, Indomalaysia and polynesia, USA to Argentina. One species in Taiwan.