Sep spreading, narrow, with incurved margins; lateral pet narrowly linear, usually turned forward under the lip, rolled and twisted, appearing thread- like; lip broad above a narrow base, declined; column longer than in Malaxis (in our spp. ca 3-4 mm), strongly curved, with narrow lateral wings above; pollinia 4; low orchids from a corm or pseudobulb, producing a few basal scale-lvs, 2 large, shining foliage lvs near the base, and a naked scape bearing a loose raceme. 250, ±cosmop.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.