Plants forming small or large, open colonies, acaulescent or occasionally caulescent and arborescent, rhizomatous; rosettes usually small. Stems 0.6–1 m. Leaf blade linear, plano-convex or plano-keeled, widest near middle, 40–65 × 0.3–0.7(–1.5) cm, rigid, margins entire, filiferous, white, apex spinose, spine acicular, 7 mm. Inflorescences paniculate, arising within or occasionally beyond rosettes, narrowly ellipsoid, 6–10 dm, distance from leaf tips to proximal inflorescence branches less than twice leaf length when fully expanded, glabrous; branches to 13 cm; bracts erect; peduncle scapelike, 0.5–1 m, less than 2.5 cm diam. Flowers pendent; perianth globose; tepals connate, dull green, sometimes tinged pink, 4.1–6.5 × 1.5–2.5 cm; filaments shorter than pistil, flaccid; anthers 3.2 mm; pistil ovoid to obovoid, 2.5–3 × 0.5–0.9 cm; style bright green; stigmas lobed. Fruits erect, capsular, dehiscent, symmetrical or rarely constricted, 4.5–5.5(–6.3) × 3–5 cm, dehiscence septicidal. Seeds glossy black, thin, 11–14 × 8–11 mm.
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