Plants up to 70 cm high, xerophytic, solitary or in clumps. Roots many, whitish, thin or slightly swollen at times. Rhizome horizontal, unbranched or branched, forming clumps of plants. Leaves 4-12 per tuft, often persisting for a long time, erect, linear, 20-50 cm long, 2-4 mm wide, sclerotic, ribbed, glabrous, the margins usually raised, yellow, occasionally with a spiral twist; sometimes outer leaves consisting of a membranous sheath only without a lamina. Inflorescence usually much taller than the leaves, branched or reduced to a simple raceme; lowest branches with unequal, accessory branches, scape terete, firm, shiny; bracts small, deltoid apiculate; pedicels short, up to 4 mm long in fruit, erect. Flowers with perianth immaculate, white, rotate: segments ca. 8 mm long; ovary with 4 ovules per cell. Capsule globose, ca. 5 mm in diam. Seeds ca. 2 mm in diam. black, minutely verrucose (mature?).
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Rhizomatous perennial to 60 cm, often on cliffs, roots many, wiry. Leaves linear to filiform. Flowers in a slender, sparsely branched raceme, white. Fruits 5 mm long, on short pedicels.
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