Perennials. Rootstock ± vertical, 5-12 mm in diam., not tuberculate, with thickened roots along rootstock. Stem 16-50 cm tall, erect, not rooting at nodes, with 0.2-1.3 mm retrorse to patent nonglandular trichomes and rarely 0.7-0.8 mm patent glandular trichomes. Stipules broadly lanceolate, connate at least at base. Leaves opposite; petiole with 0.3-1.3 mm patent to retrorse nonglandular trichomes and rarely 0.7-0.8 mm patent glandular trichomes; leaf blade 3.4-6.8 cm, palmately cleft, ratio of main sinus/middle segment length = 0.73-0.89, pilose with appressed nonglandular trichomes and rarely patent glandular trichomes; segments 5, rhombic, 3.5-7.5 mm wide at base, 6-18-lobed in distal half, ratio of second sinus/middle segment length = 0.17-0.28. Cymules solitary, 2-flowered; peduncle 3.9-10.3(-20) cm. Pedicel 0.4-4 cm, with 0.4-0.9 mm uncinate patent nonglandular trichomes and purplish 0.4-0.8 mm patent glandular trichomes; bracteoles linear-lanceolate. Sepals 8.4-10.8 mm, mucro 0.8-2.2 mm, ratio of mucro/sepal length = 0.09-0.22, outside with 0.3-1.4 mm antrorse ± appressed nonglandular trichomes and purplish 0.3-1.1 mm patent glandular trichomes, inside glabrous. Petals white or pale pink, (1-)1.2-1.5(-2) cm, reflexed, basally sometimes outside and also usually inside with trichomes, margin basally with a dense tuft of trichomes, apex rounded. Staminal filaments reddish purple to pink, lanceolate, abaxially sparsely pilose and proximal half ciliate, trichomes 0.2-1.1(-1.6) mm; anthers blackish, 1.8-2.6 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma pale pink to purplish. Fruit 2.5-3.2 cm, nodding when immature; mericarps smooth, with a basal callus, with 0.5-1 mm ± patent nonglandular trichomes; rostrum 1.7-2.2 cm, with a 5.2-6.2 mm narrowed apex; stigmatic remains 2.6-3.3 mm. Seeds 2.7-3 mm. Fl. and fr. Jul- Aug. 2n = 28.