Deciduous geophyte, 120-300 mm high; plants clump-forming or roots stoloniferous. Rhizome short, vertical; roots swollen, fused above with rhizome, split below into elongate tubers or thinner and wiry, firm-textured, bright red internally with flaking, dark brown, leathery periderm, lanate distally, staining purple when pressed. Cataphylls surrounding shoots as well as leaf-and scape-bases, papery, white tinged red, 5-15 mm long. Leaves 10-35, erect, filiform, 60-150 x 0.5-1.0 mm, muricate or hirsute, straight. Inflorescence a simple raceme or with 2 or 3 branches, peduncle erect, terete, 2-3 mm diam. at base, hirsute; bracts ovate-acuminate, white, membranous, 5-10 x 2-3 mm, ciliate; pedicels erect, 8-15 mm long at anthesis, ultimately 10-20 mm long in fruit. Flowers patent, cream with brown midribs and paired maculae near base; tepals spreading but suberect and weakly clawed in basal ± 1 mm, outer elliptical, 7-8 x 1.5-2.0 mm, inner obovate, 7-8 x 2-3 mm. Stamens weakly dimorphic, suberect but sometimes upcurved apically; filaments filiform, white, outer ± 5 mm long, inner ± 6 mm long, weakly retrorsely scabrid; anthers yellow, 0.5-1.0 mm long. Ovary globose, ± 1.5-2.0 mm long, brownish, with ± 4 ovules per locule; style upcurved apically, filiform,± 5-6 mm long, white. Capsule globose, 4-6 x 3-4 mm, light brown. Seeds angular, ± 1-2 x 1.0-1.5 x 1 mm, black or greyish-black, surface verrucose with wart-like idioblasts (some-times visible as white spots) containing raphide crystals.
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Like T. sanguinorhiza but leaves hairy and straight, peduncle hairy, and pedicels 8-15 vs. 3-6 mm long.