Rhizomes cylindrical. Leaves spreading, succulent, to 26.5 × 1.4 cm; blade green with darker green or brown narrowly elongate spots, channeled, lanceolate, margins with coarse, distantly spaced, cartilaginous teeth. Scape to 3 dm (-6 dm in cultivation). Inflorescences dense or lax, 0.8-2(-3.5) dm, 10-21-flowered. Flowers semierect, sessile; tepals white, maturing to rose; perianth tube narrowly funnelform, 2.3-3.6 cm; limb lobes recurved, 0.8-1.9 × 0.2-0.35 cm; filaments included, attached at top of tube; anthers nearly sessile; ovary 4-6 mm; style included, 1.4-2.8 cm; stigma white, deeply 3-lobed, lobes reflexed. Capsules depressed-globose, 1 × 1-1.3 cm. 2n = 60.

Flowering late summer--early fall. Clay slopes, dry gravelly hills or sandy prairies; of conservation concern; 0--100 m; Tex.; Mexico (Tamaulipas).