Herbs perennial. Roots fibrous, subequally thick. Stems erect, 17--30 cm, sparsely puberulent above, branched. Basal leaves 1 or 2; petiole 2.5--5 cm, glabrous; blade deltoid or triangular, 0.9--2.2 × 0.8--1.6 cm, thinly papery, glabrous, base truncate or truncate-cordate, margin unequally denticulate, apex acute. Lower stem leaves similar to basal ones, upper stem leaves short petiolate, narrowly triangular or lanceolate, 2.6--4.2 × 0.5--1.4 cm. Compound monochasium terminal, corymbose; bracts narrowly lanceolate. Flowers ca. 0.6 cm in diam. Pedicel 0.6--1.5 cm, appressed puberulent. Receptacle puberulent. Sepals 5, elliptic, ca. 2.2 mm, abaxially pilose. Petals 5, orbicular-obovate or suborbicular, 2.2--2.5 × ca. 2 mm, apex rounded. Stamens numerous; anthers narrowly ellipsoid. Aggregate fruit broadly ovoid, 2--3 × ca. 2.5 mm; carpels numerous. Achene slightly bilaterally compressed, obliquely obovoid, ca. 1 × 0.8 mm, glabrous, sparsely tuberculate; style persistent, ca. 0.1 mm. Fl. Apr--May, fr. May.
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