herbs. Stems clustered, erect or pendulous, bilaterally flattened, leafy.
Leaves distichous, narrowly oblong to linear-lanceolate, base sheathing and
articulate. Inflorescence terminal, globose heads or panicle, surrounded by
bracts, densely many flowered, rarely few to single flowered. Flowers
resupinate, white or yellow, occasionally reddish, small. Sepals and petals
free. Lateral sepals forming a mentum containing saccate lip base. Petals
narrower than sepals; lip entire or 3-lobed. Column short, foot rudimentary;
anther incumbent; pollinia 8, waxy, caudicle short, viscidium solitary; stigma
suborbicular, concave; rostellum conspicuous, subtriangular.