Perennial herb, geophyte, 0.5-1.2 m high; roots spiny; corm surrounded by small cormlets at base; stem bearing cormlets in lower axils, terete or grooved above, several-branched. Leaves several, in a 2-ranked fan, linear, canaliculate. Spathes herbaceous, apex dry, attenuate. Inflorescence with bright yellow flowers; nectar guides dark yellow; tepals unequal, reflexed, outer 30-50 mm long, inner 35 mm long. Stamens: filaments usually free, 10-15 mm long; anthers ± 10 mm long. Ovary 3-5 mm long, obovoid-truncate; style branches 20-25 mm long; crests well developed. Flowering time July-Dec. Capsule ± globose, truncate.
Cormous geophyte, 50-120 cm, much-branched, roots spiny. Leaves several in a distichous fan, linear, channelled. Flowers yellow.