Perennials. Rootstock tubercles subglobose, 6.2-13.7 × 6.1-13.7 mm, with nontuberous separations 0.1-4.8 cm, 0.6-2.1 mm in diam., without thickened roots. Stem 19-46 cm tall, erect, not rooting at nodes, with 0.1-0.8 mm patent to retrorse nonglandular trichomes. Stipules lanceolate, distinct. Leaves 1(or 2) alternate but opposite at inflorescence; petiole with 0.1-0.8 mm patent to retrorse nonglandular trichomes; leaf blade 2.3-6.6 cm, palmately divided, pilose with appressed nonglandular trichomes; segments 5 or 7, rhombic to rarely linear-lanceolate, (1-)3-15-lobed at apex, ratio of second sinus/middle segment length = 0.23-0.84. Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle (0-)0.3-5.6 cm. Pedicel 0.4-2.2 cm, with 0.3-1.1 mm patent nonglandular trichomes; bracteoles linear-lanceolate. Sepals 4.4-6.8 mm, mucro 0.2-2.7 mm, ratio of mucro/sepal length = 0.05-0.42, outside with 0.3-2.2 mm ± patent nonglandular trichomes, inside glabrous. Petals purplish, (0.8-)1-1.4(-1.5) cm, erect to patent, both surfaces glabrous, margin basally ciliate, apex emarginate with a 0.9-4.8 mm notch. Staminal filaments pinkish, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.3-2.7 mm; anthers yellowish, 1.1-2.4 mm. Nectaries 5, hemispheric, glabrous. Stigma dark purplish. Fruit 2.1-2.9 cm, erect when immature; mericarps smooth, without a basal callus, with 0.3-2.2 mm ± patent nonglandular trichomes; rostrum 1.5-2.4 cm, with a 1.7-3 mm narrowed apex; stigmatic remains 1.1-2.3 mm. Seeds 2-2.5 mm. Fl. May-Jun, fr. Jun.
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