Slender plants up to 40 cm high. Roots thin, wiry. Stem woody, branched near the base into about 5 very short, woody contracted shoots, which are densely covered with the congested tubular, membranous leaf-bases. Leaves many per shoot, lamina contracted above the base, linear, up to 40 cm long, 2 mm broad, triquetrous, somewhat leathery, muriculate or glabrous. Inflorescence an elongated, simple or few-branched, glandular-scabrid raceme; flowers laxly arranged; scape muricate, the scabrid points gland-tipped when young; bracts small, deltoid, apiculate; pedicels up to 2 cm long, patent with the apex recurved in fruit. Flowers with a maculate perianth, segments7 mm long; filaments with long retrorse bristles; ovary glandular, with 2 ovules per cell. Capsule obtriangular, trisulcate, stipitate, 5 mm long, the apical tubercles larger; persistent perianth-cup forming a frill at the base. Seeds usually 2 per loculus, ovoid.5 mm in diam., grey, flattened, coarsely verrucose and with hard ridges.
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Like T. sabulosa but fruits conspicuously stalked, 5 mm long, sparsely covered with simple protuberances.