Perennials. Rootstock ± horizontal, 4.5-7.9 mm in diam., not tuberculate, with thickened roots along rootstock. Stem 25-60 cm tall, erect, not rooting at nodes, with scattered 0.2-0.5 mm retrorse appressed nonglandular trichomes and sometimes scattered 1-1.2 mm patent glandular trichomes. Stipules lanceolate, distinct. Leaves 1(or 2) alternate but opposite at inflorescence; petiole with 0.3-0.6 mm retrorse ± appressed nonglandular trichomes; leaf blade 3.4-7.2 cm, palmately cleft, ratio of main sinus/middle segment length = 0.78-0.82, pilose with appressed nonglandular trichomes and rarely ± patent glandular trichomes; segments 5, rhombic, 7.3-9.4 mm wide at base, 7-13-lobed in distal half, ratio of second sinus/middle segment length = 0.18-0.27. Cymules solitary, 2-flowered; peduncle 6-11.9 cm. Pedicel 2.2-3.3 cm, with 0.2-0.6 mm retrorse ± appressed nonglandular trichomes; bracteoles lanceolate. Sepals 6.6-7.8 mm, mucro 1.6-2.5 mm, ratio of mucro/sepal length = 0.22-0.37, outside with 0.1-1.2 mm antrorse to patent nonglandular trichomes, inside glabrous. Petals 1.1-1.6 cm, erect to patent, basal 1/3-1/2 of both surfaces with trichomes, margin basally ciliate, pink to purplish, apex rounded. Staminal filaments pinkish, lanceolate, base slightly dilated, abaxially densely covered with 0.4-0.7 mm trichomes but glabrous toward tip; anthers brownish, 1.6-2 mm. Nectaries 5, hemispheric, abaxially glabrous, apex usually with a tuft of trichomes. Stigma reddish. Fruit 1.8-1.9 cm, erect when immature; mericarps smooth, with a basal callus, with 0.3-0.4 mm ± patent nonglandular trichomes; rostrum 1.1-1.2 cm, with a 1.9-2.2 mm narrowed apex; stigmatic remains 3.6-3.8 mm. Seeds 2.4-2.5 mm. Fl. Jun-Aug, fr. Sep-Oct.
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