Habit: saprophytic herbs

Tuber: present

Stem: without leaf, noded, with scalelike sheath or roots

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: pendulous

Sepal: free or similar

Labellum: not lobed

Column: without column foot

Rostellum: absent

Pollinia: number: 2

Pollinia: other characteristics: granular-farinaceous, with caudicle or viscidium