Root tubers usually several in a row (moniliform), narrowly ovoid or shortly fusiform. Stems erect, 15--25 cm tall, 4-angled, with 2 lines of hairs. Leaves sessile, linear or lanceolate-linear, 3--5(--7) cm × 2--3(--5) mm, thin, margin ciliate at base, abaxially grayish blue; midvein prominent. Chasmogamic flowers solitary or in dichasium; pedicel 5--15 mm, slender; sepals 5, green, lanceolate, abaxially pubescent, margin membranous, apex acuminate; petals 5, obovate, slightly longer than sepals, apex 2-lobed; stamens shorter than petals, anthers brown; styles 2 or 3, usually exserted. Cleistogamic flowers axillary on stem or terminal on a dwarf shoot; sepals narrowly lanceolate, abaxially pubescent, apex acuminate; petals absent. Capsule ovoid, slightly longer than sepals, 3-valved. Seeds reniform, ca. 1.5 mm, tuberculate, apex of tubercles awned. Fl. and fr. Jun--Jul.
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