Habit: terrestrial herbs, epiphytic herbs

Stem: unbranched, with leaves, noded

Leaf: characteristics: sheathing or noding at base, base clasping

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: pendulous

Petal: similar to sepals, narrower than sepals or as long as dorsal sepal

Labellum: with sac or spur or auricles at base, adnate to column

Column: with wing or triangular-falcate or arm-shaped or subulate appendages, without column foot

Stigma: concave

Rostellum: 3-lobed

Pollinia: number: 8

Pollinia: other characteristics: without caudicle