Vasc. Pl. Texas ed. 2, 18. 1990.
Storage roots enlarged 2–8 cm from corms, 2–5 cm, or thickened throughout. Leaves: basal (2–)5–12, 15–50 cm × 4–12(–16) mm, blade narrowly linear to narrowly elliptic, margins entire, often short-ciliate; cauline 1–5, 6.5–27 cm, blade long-acuminate, the proximal usually exceeding next node. Inflorescence 1, 0–4-branched, 18–76 cm, glabrous or scabrescent. Flowers facing outward or somewhat declinate; tepals elliptic, 10–20 mm, outer 2.5–4.5 mm wide, inner 4.5–8 mm wide; filaments inserted in covered pits, narrowly cylindric, (4–)5–9.5 mm; anthers distinct, usually not versatile, usually twisted and/or reflexed, thus appearing versatile, 2–3 mm; ovary 2–5 mm. Capsules broadly oblong to oblong, 8–14 × 5–7 mm.
Phenology: Flowering Apr, May, Aug–Dec.
Habitat: Coastal plains, piedmont
Elevation: 0–1000 m
Tex., Mexico (San Luis Potosí, Tamaulipas).