Perennials. Rootstock ± horizontal, 5.2-14 mm in diam., not tuberculate, with thickened and napiform roots along rootstock. Stem 21-80 cm tall, erect, not rooting at nodes, with 0.1-0.5 mm patent to retrorse nonglandular trichomes. Stipules broadly lanceolate, distinct or connate at least at base. Leaves opposite; petiole with 0.3-1.4 mm patent to retrorse nonglandular trichomes; leaf blade 2.5-9.6 cm, palmately cleft, ratio of main sinus/middle segment length = 0.71-0.85, pilose with appressed nonglandular trichomes; segments 5, rhombic, 0.3-1.7 cm wide at base, 7-13-lobed in distal half, ratio of second sinus/middle segment length = 0.16-0.42. Cymules solitary, 2-flowered; peduncle 1.6-15.8 cm. Pedicel 0.7-4.4 cm, with 0.1-1.1 mm patent to retrorse nonglandular trichomes; bracteoles lanceolate. Sepals 6.3-7.9(-8.4) mm, mucro 0.7-3.2 mm, ratio of mucro/sepal length = 0.11-0.49, outside with 0.2-1.7 mm antrorse to patent nonglandular trichomes, inside glabrous. Petals pink to purplish, (1-)1.2-1.4 cm, erect to patent, outside basally with trichomes, inside basal 1/3-1/2 with trichomes, margin basally ciliate, apex rounded. Staminal filaments purplish, lanceolate, base slightly dilated, abaxially densely covered with 0.4-2 mm trichomes but glabrous toward tip; anthers purplish, 1.6-2.4 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma reddish. Fruit 1.9-2.4 cm, erect when immature; mericarps smooth, with a basal callus, with 0.2-1 mm ± patent nonglandular trichomes; rostrum 1.1-1.5 cm, with a 2-3.2 mm narrowed apex; stigmatic remains 2.3-5 mm. Seeds 1.8-2.8 mm. Fl. Jun-Jul, fr. Aug-Sep.
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