Small annual or perennial herbs. Leaves
subrosulate or scattered. Flowers bracteate, bract single or sometimes paired
on 1 to many-flowered peduncles on scapes, cymose or racemose. Petals 5, 2 or 4
of them connate in pairs, the 5th one smaller, recurved and developed as
labellum. Stamens: stylar column, usually exserted, anthers sessile, 2-celled.
Ovary inferior, 2-celled or partially 1-celled by an imperfect septum, ovules
numerous. Fruits dehiscing from apex downwards or opening in middle but united
at apex and base. Seeds minute, oblong.