Perennials. Rootstock ± vertical, 0.8-1.3 cm in diam., not tuberculate, with thickened roots along rootstock. Stem 28-54 cm tall, erect, not rooting at nodes, with 0.3-0.6 mm retrorse ± appressed nonglandular trichomes. Stipules broadly lanceolate, connate at least at base. Leaves opposite; petiole with 0.3-0.7 mm retrorse ± appressed nonglandular trichomes; leaf blade 2.6-6 cm, palmately cleft, ratio of main sinus/middle segment length = 0.71-0.86, pilose with appressed nonglandular trichomes; segments 5, rhombic, 3.9-10.7 mm wide at base, 5-16-lobed in distal half, ratio of second sinus/middle segment length = 0.19-0.31. Cymules solitary, 2-flowered; peduncle 3.7-7.9(-12.8) cm. Pedicel 1.1-3.6 cm, with 0.3-0.7 mm retrorse ± appressed nonglandular trichomes; bracteoles lanceolate. Sepals 6.6-13.2 mm, mucro 1-1.9 mm, ratio of mucro/sepal length = 0.09-0.25, outside with 0.6-1.3 mm antrorse ± appressed nonglandular trichomes and rarely 0.9-1 mm patent glandular trichomes, inside glabrous. Petals pink to purple, (1.3-)1.6-1.9(-2.1) cm, erect to patent, basally with a dense tuft of trichomes on both surfaces and margin, apex rounded. Staminal filaments purplish or white, lanceolate, abaxially densely pilose and proximal half ciliate, trichomes 1.2-2 mm; anthers blackish, 1.9-2.7 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma purplish. Fruit 2.2-3.3 cm, nodding when immature; mericarps smooth, with a basal callus, with 0.4-1 mm ± patent nonglandular trichomes; rostrum 1.4-2.4 cm, with a 2.3-7.7 mm narrowed apex; stigmatic remains 2.4-4.2 mm. Seeds 2.4-3 mm. Fl. Jun-Aug, fr. Aug-Sep.
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