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Perennials. Rootstock ± horizontal, 1.4-4.1 mm in diameter, not tuberculate, with thickened roots along rootstock. Stem 8-25 cm tall, erect, not rooting at nodes, with 0.2-0.6 mm retrorse to appressed nonglandular trichomes. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.5-1 mm retrorse to appressed nonglandular trichomes; leaf blade 1.4-3.3 cm long, palmately cleft, pilose with appressed nonglandular trichomes; segments 5, rhombic to obtriangular, 1.5-3 mm wide at base, 3-9-lobed in distal half. Cymules solitary, 2-flowered; peduncle 3-10 cm long. Pedicel 1.2-5 cm long; bracteoles linear-lanceolate. Sepals 7-10 mm long, mucro 0.6-1.2 mm long, outside with 0.3-1.2 mm antrorse to patent nonglandular trichomes, inside almost glabrous. Petals deep purplish, 1.5-2.3 cm long, erect to patent, margin basally ciliate, apex emarginate with a 1-4.5 mm notch. Staminal filaments dark red distally but paler at base, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.4-0.8 mm; anthers reddish, 2-2.9 mm long. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma dark red. Fruit 2.2-2.6 cm, erect when immature.