Phreatia Lindl., Gen. Sp. Orchid. Pl. (1830) 63
- Genus Plexaure Endl., Prodr. Fl. Norf. (1833) 30
Monopodial or sympodial plants, without, or with very short to long rhizomes. Stem very short or elongated. Pseudobulbs present or not, consisting of one to several internodes, when present 1- to few-leaved, when pseudobulbs absent stem few- to many-leaved. Leaves sheathing at the base, glabrous, rarely laterally compressed, deciduous, duplicate, rather thin-textured to leathery or carnose. Inflorescence lateral from the base of the pseudobulb, or lateral from the stem, a many-flowered raceme. Flowers small to very small, resupinate, white or greenish. Sepals free. Petals free, usually similar to the dorsal sepal, but somewhat smaller. Lip with or without spur, not mobile. Column-foot present. Pollinia 8, solid, caudicles present, stipe absent, viscidium present.