Solitary, glabrous plants variable in size, up to 100 cm tall but usually much smaller. Roots wiry, thin. Rhizome small, woody. Leaves many, forming a basal, erect rosette; outer leaves smaller, often consisting only of a tubular sheath without a lamina; lamina of produced leaves linear to semi-terete, up to 50 cm long, 2-10 mm broad, long tapered in upper half, ribbed, margin minutely denticulate. Inflorescence divaricately few-branched or simple; lowest branches showing suppressed accessory branches; scape usually about as long as the leaves, firm, terete, arcuate; side-branches curved upwards, densely flowered near the top; bracts small, 5 mm, acuminate; a few sterile bracts from suppressed side-branches often present on scape; pedicels erect, up to 1 cm in fruit, those of dropped sterile flowers recurved. Flowers with perianth immaculate, white often tinged with pink; segments 14 mm long; ovary with 6 ovules per cell. Capsule globose, succulent, glabrous, sulcate 9 mm long. Seed rough, with 3 large crenulate ridges or wings.
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Rhizomatous perennial to 1.2 m, roots wiry. Leaves lanceolate to linear, fibrotic. Flowers congested in a sparsely branched, ascending raceme, white. Fruits 9 mm long.