Perennials. Rootstock ± vertical, 0.6-1.6 cm in diam., not tuberculate, without thickened roots. Stem 16-72 cm tall, erect or ascending, not rooting at nodes, with 0.1-0.3 mm uncinate nonglandular trichomes, 0.3-3.5 mm patent glandular trichomes, and usually 0.5-3.3 mm patent nonglandular trichomes. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.1-0.3 mm uncinate nonglandular trichomes, 0.4-3.2 mm patent glandular trichomes, and usually 0.4-3.1 mm patent nonglandular trichomes; leaf blade 2.4-5.3 cm, palmately cleft, ratio of main sinus/middle segment length = (0.55-)0.67-0.76(-0.8), pilose with ± appressed nonglandular and glandular trichomes; segments 5, obtriangular, 4.8-11.7 mm wide at base, 9-16-lobed in distal half, ratio of second sinus/middle segment length = 0.14-0.28. Cymules solitary, 2-flowered; peduncle 1.1-14.5 cm. Pedicel 0.8-3.2 cm, with 0.1-0.3 mm uncinate nonglandular trichomes, 0.6-2 mm patent glandular trichomes, and usually 0.2-2.2 mm patent nonglandular trichomes; bracteoles lanceolate. Sepals 4.9-7.3 mm, mucro 0.8-2.4 mm, ratio of mucro/sepal length = 0.17-0.35, outside with 0.1-0.5 mm ± patent nonglandular trichomes and 1-3.4 mm patent glandular trichomes, inside glabrous adaxially. Petals white or pinkish, 8.6-9.8(-10.6) mm, erect to patent, outside usually glabrous, inside basally with trichomes, margin basally ciliate, apex rounded. Staminal filaments whitish, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.2-0.9 mm; anthers brownish purple, 1.2-1.7 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma pinkish. Fruit 2.3-2.8 cm, erect when immature; mericarps reticulate, without a basal callus, glabrous or with 0.1-0.2 mm ± appressed nonglandular trichomes; rostrum 1.6-2 cm, without a narrowed apex or with a 0.5-1 mm narrowed apex; stigmatic remains 1.5-2.4 mm. Seeds 2.2-3.3 mm. Fl. Jun-Jul, fr. Jul-Sep.
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