Habit: terrestrial herbs

Rhizome: retrose or transverse or creeping or ascending

Pseudobulb: noded, with sheath

Leaf: characteristics: 1, petiolate

Inflorescence: type: raceme

Scape: emerging from center of leaves or pseudobulb base or rhizome

Inflorescence: other characteristics: peduncle and rachis with winged ribs or sheath

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

Petal: narrower than sepals or as long as dorsal sepal

Labellum: adnate to column

Column: with wing or triangular-falcate or arm-shaped or subulate appendages, with column foot

Pollinia: number: 2