"Suberect herbs; roots tuberous; stem 40-65 cm high, terete, glabrous. Leaves basal and cauline, 10-20 x 1-1.5 cm, linear-lanceolate, acute; cauline leaves smaller; sheath open, 2 cm long, ciliate. Cymes 8 cm long, terminal, panicled; peduncle 8 cm long. Flowers 5-20 in a cymes; pedicel 5-6 mm long; sepals 6 x 3 mm, elliptic, acute at apex; petals 8 x 5 mm, obovate, obtuse, narrow; staminodes 3, yellow, 3-lobed. Capsule 6.5 x 3 mm, ellipsoid, acute, beaked; seeds 3 x 2 mm, ellipsoid, rugose, brown."