Trans. Hort. Soc. London 7: 276, plate 8. 1828.
Plants usually bulbose; bulb coat membranous. Stems usually not branching, stout, 2–5 dm. Leaves: basal withering, 0.5–1 dm; blade linear. Inflorescences subumbellate, 1–3-flowered; bracts 3–5 cm. Flowers erect; perianth open, campanulate; sepals lanceolate, 4–5 cm, apex acuminate; petals purple, with median green stripe on abaxial surface, obovate, 4–6 cm, bearded distal to gland, apex acuminate; glands triangular-sagittate, slightly depressed, densely covered with slender hairs; filaments 8–9 mm; anthers lanceolate-linear, ca. 1 cm, apex obtuse. Capsules erect, lanceoloid-linear, angled, 4–5 cm, apex acuminate. Seeds flat, inflated. 2n = 14.
w North America.
Varieties 2 (2 in the flora).