Plants solitary or forming dense, open colonies of rosettes, acaulescent, with branching subterranean caudices; rosettes 2–10 per colony, each rosette with fewer than 100 leaves. Leaf blade lanceolate, straight, slightly concave, nearly flattened, widest at middle, 25–60 × 1–2(–2.5) cm, rigid, slightly glaucous, margins denticulate, yellow or reddish brown, hyaline. Inflorescences narrowly paniculate, arising beyond rosettes, narrowly ovoid, 3.5–10 dm, densely pubescent; bracts erect; peduncle sometimes scapelike, 0.5–1.1 m, less than 2.5 cm diam. Flowers pendent; perianth campanulate; tepals distinct, white or greenish white, ovate, 4–6 × 1.5–3 cm, apex sharply acuminate; filaments 1.8–3.2 cm; pistil 3–4.5 cm × 4–6 mm; style white or greenish, 10–20 mm; stigmas lobed. Fruits erect, capsular, dehiscent, ellipsoid, 4–6 × 1.8–3.2 cm, dehiscence septicidal. Seeds dull black, thin, 5–7 mm diam.
