Perennials. Rootstock ± vertical, 0.6-2.8 cm in diam., not tuberculate, without thickened roots. Stem 20-76 cm tall, erect or ascending, not rooting at nodes, with 0.3-2.2 mm patent nonglandular trichomes and usually 0.4-3.4 mm patent glandular trichomes or sometimes subglabrous. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.4-2 mm patent nonglandular trichomes, 0.1-0.3 mm uncinate nonglandular trichomes, and usually 0.2-2.7 mm patent glandular trichomes; leaf blade 1.8-4.9 cm, palmately cleft, ratio of main sinus/middle segment length = (0.69-)0.8-0.88, pilose with ± appressed nonglandular and glandular trichomes; segments 5, rhombic, 3.2-8.3 mm wide at base, 8-16-lobed in distal half, ratio of second sinus/middle segment length = 0.24-0.46. Cymules solitary, 2-flowered; peduncle 4.1-10.9 cm. Pedicel 0.5-2.4 cm, with 0.2-1.9 mm patent nonglandular trichomes, 0.2-0.3 mm uncinate nonglandular trichomes, and 0.4-1.7 mm patent glandular trichomes; bracteoles lanceolate. Sepals 6-7.8 mm, mucro 0.8-2.3 mm, ratio of mucro/sepal length = 0.11-0.35, outside with 0.2-1.9 mm patent nonglandular trichomes and 0.8-2.8 mm patent glandular trichomes, inside glabrous. Petals pinkish, (1-)1.2-1.5 cm, erect to patent, both surfaces basally with trichomes, margin basally ciliate, apex rounded or with a 0.5-1 mm notch. Staminal filaments yellowish, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.2-0.8 mm; anthers yellowish, 1-2.7 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma yellowish. Fruit 2.8-4.6 cm, erect when immature; mericarps reticulate, without a basal callus, with 0.1-0.2 mm ± appressed nonglandular trichomes; rostrum 1.9-3.7 cm, with a 1-2.6 mm narrowed apex; stigmatic remains 1.9-2.7 mm. Seeds 3.3-4.4 mm. Fl. Jul-Aug, fr. Aug-Sep.
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