Subtribe Polystachyinae Schltr. Orchideen: 292. 1915.
Stem reed-like, but pseudobulbs of several internodes are more frequent. Leaves duplicate. Inflorescence terminal, rare ly upper lateral.
Flowers usually non-resupinate. Column foot distinct, long and massive with lip hinged at its apex. Rostellum dome-like or erect, truncate to apiculate. Viscidium relatively large to small, lamellate, sticky, single. Tegula lamellate, single. Anther suberect to incumbent.
Pollinia 4 in two pairs, unequal in size, ellipsoid, superposed, diagonally positioned in the anther. Caudicles sticky.