Perennials. Rootstock ± horizontal, 4.3-8.7 mm in diam., not tuberculate, with thickened roots along rootstock. Stem 24-86 cm tall, erect, not rooting at nodes, with 0.3-0.7 mm retrorse ± appressed nonglandular trichomes. Stipules subulate, distinct. Leaves opposite or sometimes alternate toward base; petiole with 0.2-0.9 mm retrorse ± appressed nonglandular trichomes; leaf blade 3.7-8.1 cm, palmately cleft, ratio of main sinus/middle segment length = 0.72-0.92, pilose with appressed nonglandular trichomes; segments 3(or 5), rhombic, 0.7-1.5 cm wide at base, 7-19-lobed in distal half, ratio of second sinus/middle segment length = 0.04-0.19. Cymules solitary, (1 or)2-flowered; peduncle 1.4-4.7 cm. Pedicel 0.8-1.9 cm, with 0.1-0.5 mm retrorse ± appressed nonglandular trichomes and usually 0.2-1.1 mm patent glandular trichomes; bracteoles linear-lanceolate. Sepals 3.5-7.1 mm, mucro 0.8-2.3 mm, ratio of mucro/sepal length = 0.14-0.33, outside with 0.1-0.7 mm antrorse appressed nonglandular trichomes and 0.2-1.1 mm patent glandular trichomes, inside almost glabrous. Petals pale pink or white, 4-6.2(-6.9) mm, erect to patent, both surfaces basally with a few trichomes, margin with a few cilia, apex rounded or retuse. Staminal filaments yellowish, lanceolate with an abruptly narrowed apex, expanded base of inner whorl usually auriculate, abaxially pilose and proximal half ciliate, trichomes 0.1-0.4 mm; anthers violet-blue, 0.7-1 mm. Nectaries 5, hemispheric, glabrous. Stigma pale pink to crimson. Fruit 2-2.2 cm, erect when immature; mericarps smooth, with a basal callus, with 0.7-1.2 mm ± patent nonglandular trichomes and sometimes 0.6-1.2 mm patent glandular trichomes; rostrum 1.3-1.7 cm, with a 0.9-1.7 mm narrowed apex; stigmatic remains 1.3-2.7 mm. Seeds 2.4-2.9 mm. Fl. Jun-Jul, fr. Jul-Aug. 2n = 28.