Herbs perennial, with a 2--5 cm long, bulblike stock formed by overlapping petioles and basal bud scales. Petiole indistinct to 1/2 as long as leaf blade; leaf blade linear-lanceolate, 5--20 cm at anthesis, elongating to 30 cm at fruiting, 5--10 mm wide, base attenuate, margin serrate, apex acute. Scapes 10--20 cm; umbels 1-or 2(or rarely 3 or 4)-flowered; bracts lanceolate, 0.7--1.5 cm. Pedicel 1.5--2 cm, elongating to 5.5 cm in fruit. Flowers heterostylous. Calyx cup-shaped, 5--8 mm, parted to middle; lobes subquadrangular, ca. 2.5 mm wide, apex rounded to truncate. Corolla yellow, exannulate; tube 1.2--1.3 cm; limb 2.5--3 cm wide; lobes depressed orbicular, ca. 1 cm wide, margin entire. Pin flowers: stamens ca. 4.5 mm above base of corolla tube; style ca. 8 mm. Thrum flowers with positions reciprocal. Capsule slightly longer than calyx.
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