Perennials. Rootstock ± horizontal, 5.5-9.6 mm in diam., not tuberculate, with thickened roots along rootstock. Stem (17-)40-60(-100) cm tall, erect, not rooting at nodes, with 0.2-0.5 mm retrorse ± appressed nonglandular trichomes. Stipules lanceolate, distinct. Leaves 1(or 2) alternate but opposite at inflorescence; petiole with 0.2-0.6 mm retrorse ± appressed or uncinate nonglandular trichomes; leaf blade 3.2-6.3(-9) cm, palmately cleft, ratio of main sinus/middle segment length = (0.65-)0.77-0.83(-0.84), pilose with appressed nonglandular trichomes; segments 5, rhombic, 4-14.8 mm wide at base, 9-22-lobed in distal half, ratio of second sinus/middle segment length = 0.17-0.25. Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle 1.3-3(-11.5) cm. Pedicel 0.4-2.7 cm, with 0.1-0.4 mm retrorse uncinate nonglandular trichomes and 0.2-0.7 mm patent glandular trichomes; bracteoles lanceolate. Sepals 4-7.1 mm, mucro 0.6-2.7 mm, ratio of mucro/sepal length = 0.15-0.38, outside with 0.2-0.9 mm erect to patent nonglandular trichomes and 0.2-0.8 mm patent glandular trichomes, inside glabrous. Petals white or pale lilac, 0.8-1.3 cm, erect to patent, outside glabrous, inside basally with trichomes, margin basally ciliate, apex retuse with a 0.4-1.1 notch. Staminal filaments white, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.2-0.4 mm; anthers bluish, 1.1-1.7 mm. Nectaries 5, hemispheric, glabrous. Stigma pale pink. Fruit 1.8-2 cm, erect when immature; mericarps smooth, with a basal callus, with 0.1-0.4 mm ± patent nonglandular trichomes and sometimes apically with 0.3-0.4 mm glandular trichomes; rostrum 1.4-1.6 cm, with a 1.9-2.5 mm narrowed apex; stigmatic remains 1.1-1.5 mm. Seeds 2.3-2.5 mm. Fl. Jun-Jul, fr. Jul-Aug. 2n = 26, 28.
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