Habit: epiphytic herbs

Stem: branched, unbranched, noded

Leaf: characteristics: several to many, sheathing or noding at base, apex notched or acute or obtuse or hooked, base clasping

Leaf: position: in two rows

Inflorescence: type: raceme

Inflorescence: position: laterally on stem

Sepal: free or similar, lateral sepals spreading or oblique or reflexed or connivent

Petal: shorter or smaller than sepals

Labellum: with sac or spur or auricles at base, 3-lobed, with longitudinal ridges or keels, adnate to column

Column: with column foot, without column foot

Pollinia: number: 4

Pollinia: other characteristics: with caudicle or viscidium, with stipe