Plants forming loose colonies of rosettes, acaulescent, with branching subterranean caudices; rosettes 10–30 per colony, each rosette with fewer than 100 leaves. Leaf blade lanceolate, straight, flat except becoming concave near apex, widest above middle, 20–50 × 1–4.5 cm, flexible, glaucous, margins denticulate or sometimes wavy, yellow. Inflorescences paniculate, often distally racemose, arising beyond rosettes, 7–12 dm, with wide-spreading branchlets 1.5–2.3 dm; bracts erect; peduncle scapelike, 0.6–1.3 m, less than 2.5 cm diam., glaucous. Flowers pendent; perianth campanulate; tepals distinct, greenish white, elliptic to ovate, 5–6.5 × 2–3.2 cm; filaments 1.8–3.2 cm; pistil 3.2–4 cm; style white, 13–20 mm; stigmas lobed. Fruits erect, capsular, dehiscent, oblong-cylindric, 4.5–5.5 × 1.3–2 cm, dehiscence septicidal. Seeds dull black, thin, 5–7 mm diam.
