Perennial herb. Stems several, short. Leaves recurved, 0.5-0.7 m long, 10-15 mm wide, V-shaped in cross section, margins minutely and distantly denticulate, keel smooth. Inflorescence subequal to leaves, 0.5-0.6 m high, with ovoid to subcylindric, dense raceme. Flowers greenish yellow and spreading in bud, yellow and becoming deflexed when mature, 8-9 mm long. Flowering time Mar.