Perennial herb. Stems several, short. Leaves erect, recurved toward apex, 0.5-1.2 m long, 15-45 mm wide, V-shaped in cross section, margins and keel usually conspicuously serrulate, rarely smooth. Inflorescence overtopping leaves, 0.6-1.8 m high, with cylindric, very dense raceme. Flowers greenish white, sometimes tinged red or dull to flame-red and spreading in bud, white to greenish white with green stripe down each perianth lobe and spreading to pendulous when mature, 15-21 mm long. Flowering time Oct.-Dec.