Deciduous geophyte, 140-200 mm high. Rhizome short, vertical; roots swollen, fused above with rhizome, split below into elongate tubers tapering to wiry roots, firm-textured, bright red with flaking, dark brown and leathery periderm, staining purple when pressed. Cataphylls surrounding shoots as well as leaf-and scape-bases, papery, white tinged red, 10-30 mm long. Leaves 5-10, erect, linear-canaliculate, flushed pink basally, 100-150 x 1-2 mm, ciliate. Inflorescence racemose with 1 or 2 branches, peduncle suberect, often slightly curved, terete, 1-2 mm diam. at base, puberulous, glabrescent; bracts ovate-acuminate, white, 3-7 x 1.5-2.5 mm, glabrous; pedicels suberect, 6-10 mm long, ultimately ± 10-12 mmlong. Flowers patent, white with brown midribs and paired greenish maculae near base, opening late afternoon, unscented; tepals suberect and weakly clawed in basal ± 1 mm, spreading-recurved above, outer elliptical, 6-8 x 1.5-2.0 mm, inner narrowly obovate, 6-8 x 2-3 mm. Stamens dimorphic, suberect below but sometimes apically upcurved and lowermost filament declinate; filaments filiform, white, outer ± 5 mm long, inner ± 6 mm long, retrorsely scabrid but basal third of inner filaments patently scabrid; anthers yellow,1.5 mm long. Ovary globose, ± 1.0-1.5 mm long, brownish, with ± 4 ovules per locule; style weakly decurved, filiform, ± 4-5 mm long, white. Capsule globose to obovoid, 3-4 x 3-4 mm, light brown. Seeds angular, ± 2 x 1x1 mm, black, surface verrucose with wart-like idioblasts (sometimes visible as white spots) containing raphide crystals.
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Like T. karroica but leaves and peduncle puberulous, pedicels up to 12 mm vs. 10-20(-40) mm long.