Perennials. Rootstock ± horizontal, 5-10 mm in diam., not tuberculate, with thickened roots along rootstock. Stem 10-50 cm tall, erect, not rooting at nodes, with 0.2-0.6 mm retrorse appressed nonglandular trichomes. Stipules lanceolate, distinct. Leaves 1(or 2) alternate but opposite at inflorescence; petiole with 0.2-0.5 mm retrorse appressed nonglandular trichomes; leaf blade 3-11.7 cm, palmately cleft, ratio of main sinus/middle segment length = (0.8-)0.82-0.91, pilose with appressed nonglandular trichomes; segments 7, rhombic, 4.4-8.7(-16.9) mm wide at base, 10-34-lobed in distal half, ratio of second sinus/middle segment length = 0.18-0.35. Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle (0-)1.1-5.5 cm. Pedicel 0.3-1.8 cm, with 0.2-0.6 mm patent to retrorse nonglandular trichomes and usually 0.3-2.5 mm patent glandular trichomes; bracteoles linear-lanceolate. Sepals 0.6-1 cm, mucro 0.9-2.7 mm, ratio of mucro/sepal length = 0.14-0.32, outside with 0.2-0.8 mm antrorse appressed nonglandular trichomes and 0.3-2 mm patent glandular trichomes, inside glabrous. Petals purplish, 1.2-1.8(-2) cm, erect to patent, outside basally with trichomes, inside glabrous, margin basally ciliate, apex rounded. Staminal filaments purplish, lanceolate, abaxially pilose and proximal half ciliate, trichomes 1.5-3.2 mm; anthers bluish, 2.1-3 mm. Nectaries 5, hemispheric, glabrous. Stigma purplish. Fruit 2.7-3.7 cm, erect when immature; mericarps smooth, with a basal callus, with 0.1-1.1 mm ± patent nonglandular trichomes and 0.8-1.4 mm patent glandular trichomes; rostrum 2.2-3 cm, with a 5-7.4 mm narrowed apex; stigmatic remains 1.6-2.3 mm. Seeds 2-2.9 mm. Fl. Jul-Aug, fr. Aug-Sep. 2n = 28.