Perennial herb. Stems few to several, short. Leaves falcate, flaccid, 0.15-0.30 m long at flowering stage, elongating up to 0.6 m, 15-30 mm wide, V-shaped in cross section, margins and keel finely serrulate. Inflorescence overtopping recurved leaves, 0.25-0.50 m high, with subglobose, apically lax, basally dense raceme. Flowers greenish yellow, tinged with dull red and spreading in bud, lemon-yellow and pendulous when mature, 35-40 mm long. Flowering time Aug.-Oct.