Erect or pendent epiphyte; stems slender, covered by closely imbricating bracts; upper pair of bracts often foliaceous; pseudobulbs oblong-elliptic, rugose when dry, 1.5-5 cm long, inserted at an angle on the stem. Leaves 2 or 3 (sometimes 1 or 4) from apex of pseudobulb, ligulate, 4-18 cm long, to 1.5 cm wide, conduplicate and short-petiolate at base. Flowers solitary on 1 to several scapes from base of mature pseudobulb; scapes 2-4 cm long, bracteate; sepals and petals usually curved in the same direction; sepals subequal, linear-lanceolate,1.5-3 cm long, greenish-yellow or greenish-lavender, the laterals adnate to base of column; petals 1-2.5 cm long, greenish-yellow, somewhat smaller than sepals; lip entire, linear-oblanceolate,1-2.5 cm long, 3-6 mm wide, pale yellow-green, geniculate and +/- S-shaped in side view, the lateral margins +/- erect, dark maroon and thickened at apex, articulated with foot of column. Fruits +/- oblong, narrowly tapered at apex, 2.5-3 cm long, ca 6 mm wide, bluntly 3-sided, slightly pruinose, the 3 ribs ca 1.5 mm wide, very thin-winged marginally, the old flower persisting. Shattuck 453.