Perennials. Rootstock ± horizontal, 5-8 mm in diam., not tuberculate, with thickened roots along rootstock. Stem 26- 60 cm tall, erect, not rooting at nodes, with 0.2-0.4 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 3.9-7.4 cm, palmately cleft, ratio of main sinus/middle segment length = (0.81-)0.87-0.91, pilose with appressed nonglandular trichomes; segments 5 or 7, rhombic, 1.7-4.5 mm wide at base, 8-22-lobed in distal half, ratio of second sinus/middle segment length = 0.18-0.29(-0.41). Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle 1.4-5.6(-11.5) cm. Pedicel 0.8-2.1 cm, with 0.2-0.5 mm retrorse not appressed nonglandular trichomes and sometimes 0.2-0.4 mm patent glandular trichomes; bracteoles lanceolate. Sepals 3.4-5.8 mm, mucro 0.7-1.7 mm, ratio of mucro/sepal length = 0.12-0.31, outside with 0.4-1.2 mm ± patent nonglandular trichomes and sometimes 0.2-0.6 mm patent glandular trichomes, inside glabrous. Petals purplish, 1-1.1 cm, erect to patent, outside glabrous, inside basally with trichomes, margin basally ciliate, apex rounded. Staminal filaments white, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.2-0.4 mm; anthers bluish, 1.2-1.4 mm. Nectaries 5, hemispheric, glabrous. Stigma purplish. Fruit 2.3-2.5 cm, erect when immature; mericarps smooth but sometimes with 1 or 2 transversal veins at apex, with a basal callus, with 0.1-0.3 mm ± appressed nonglandular trichomes and 0.6-0.8 mm patent glandular trichomes; rostrum 1.7-1.8 cm, with a 2-3 mm narrowed apex; stigmatic remains 1.5-2.2 mm. Seeds 2.3-2.4 mm. Fl. Jul-Aug, fr. Aug-Sep. 2n = 28.