Herbs, perennial, 15-20 cm tall. Roots numerous, thick, woody. Stems much branched, tender. Leaves with 2 leaflets; petiole equal to or shorter than leaflets, with linear wings; leaflet blades oblong to oblanceolate, 1.5-2.5 cm × 5-6 mm, thin, apex obtuse. Flowers axillary, solitary or paired. Pedicel 1-1.5 cm. Sepals 5, unequal, 0.7-1.5 cm. Petals 5, ovate, 4-5 mm. Stamens 1-1.2 cm, obviously longer than petals; appendages dissected. Capsule cylindric to oblong, 10-16 × ca. 5 mm, with 5 ridges, apex obtuse. Seeds reniform, ca. 3 × 1.5-2 mm. Fl. May-Jun, fr. Jul.
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