Habit: epiphytic herbs

Stem: tufted or separate, noded

Leaf: characteristics: sheathing or noding at base

Leaf: position: alternate, distichous

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Sepal: lateral sepals adnate to column foot or labellum forming a mentum

Petal: narrower than sepals or as long as dorsal sepal

Labellum: not lobed

Column: with column foot

Pollinia: number: 4

Pollinia: shape: obovate

Pollinia: other characteristics: with caudicle or viscidium