Usually 10-20 cm high, dense, with glabrous branchlets. Leaves 1-1.5 mm long, appressed in the lower half, partly imbricate, erect-spreading above the middle, ovate, obtuse or, at first, acute, minutely apiculate, rather acutely or less often obtusely convex beneath, slightly convex on the upper half above, glabrous. Flowers sessile, subtended by scale-like involucral leaves about 1-5 mm long. Calyx-segments oblong-lanceolate with an oblong base, or entirely linear-lanceolate, obtuse, slightly convex on the dorsal surface, glabrous. Petals 1.75-2 mm long, consisting of a broadly oblong reddish claw and an ovate or obovate subacute white lamina. Anthers 0-5 mm long, linear-lanceolate, obtuse, reaching to the middle of the petals. Ovary capped with a slightly conical style-base, unilocular, with 4 ovules suspended round a central column: stylar column 0.5-0.7 mm long. Fruit very shortly cylindric, supported by a disc-like stipe and capped with the disc-like style-base.
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Like T. uniflora but flowers with ovary glabrous, capped with conical style base, styles up to half as long as petals.