118. Polystachya Hooker, Exot. Fl. 2: ad t. 103. 1824.
多穗兰属 duo sui lan shu
Authors: Xinqi Chen & Jeffrey J. Wood
Herbs, epiphytic or lithophytic. Stem erect, often pseudobulbous or fusiform, simple or superposed, with 1 to several leaves. Leaves conduplicate, often narrowly oblong or oblong, sheathing and articulate at base. Inflorescences terminal, racemose or paniculate, few to many flowered; peduncle often enclosed in scarious sheaths. Flowers not resupinate, small or sometimes medium-sized. Sepals connivent or spreading; dorsal sepal free; lateral sepals adnate to column foot forming a mentum. Petals smaller, usually linear; lip superior, entire or 3-lobed, base articulate with column foot, spurless; disk often farinaceous (pseudopollen). Column short, with conspicuous column foot; pollinia 4 (unequal in size, in 2 pairs) or 2 (each deeply cleft), waxy, with a small stipe and a viscidium.
About 200 species: centered in Africa, some species in tropical America, and one pantropical species widespread in Asia from Sri Lanka and India eastward to Sulawesi and the Philippines, including China.