Perennials. Rootstock ± horizontal, 6-11 mm in diam., not tuberculate, without thickened roots. Stem 22-84 cm tall, erect, not rooting at nodes, with 0.4-1.2 mm retrorse appressed nonglandular trichomes and rarely 1.8-2.6 mm patent glandular trichomes. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.3-0.8 mm retrorse appressed nonglandular trichomes and rarely 1.4-1.9 mm patent glandular trichomes; leaf blade 4.3-10.1 cm, palmately cleft, ratio of main sinus/middle segment length = 0.69-0.87, pilose with appressed nonglandular trichomes; segments 5, rhombic, 0.7-1.4 cm wide at base, 13-23-lobed in distal half, ratio of second sinus/middle segment length = 0.14-0.24. Cymules solitary, 2-flowered; peduncle 3.5-15.9 cm. Pedicel 2-4 cm, with 0.2-0.5 mm retrorse appressed or uncinate nonglandular trichomes and sometimes 0.9-1.9 mm patent glandular trichomes; bracteoles lanceolate. Sepals 5.7-8.5 mm, mucro 1.1-2.8 mm, ratio of mucro/sepal length = 0.18-0.33, outside with 0.2-0.5 mm antrorse ± appressed nonglandular trichomes and usually 1.5-3.1 mm patent glandular trichomes, inside glabrous. Petals bright rose-pink, (1.3-)1.4-1.6(-1.8) cm, erect to patent, outside usually glabrous, inside basally with trichomes, margin basally ciliate, apex emarginate with a 0.3-0.7 mm notch. Staminal filaments white, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.2-0.4 mm; anthers whitish with a blue margin, 1.4-2.1 mm. Nectaries 5, hemispheric, glabrous. Stigma pinkish. Fruit 2.8-3.1 cm, erect when immature; mericarps smooth, with a basal callus, with 0.4-0.7 mm ± appressed nonglandular trichomes; rostrum 2-2.2 cm, with a 4-4.5 mm narrowed apex; stigmatic remains 2.3-2.6 mm. Seeds 2.2-2.6 mm. Fl. Jul-Aug, fr. Aug-Sep.
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