Perennials. Rootstock ± vertical, 2-3.3 mm in diam., not tuberculate, with thickened and napiform roots along rootstock. Stem 4-17(-25) cm tall, erect, not rooting at nodes, with 0.2-0.6 mm retrorse appressed nonglandular trichomes and rarely 0.3-0.7 mm patent glandular trichomes. Stipules lanceolate to ovate, distinct. Leaves opposite; petiole with 0.3-0.7 mm retrorse ± appressed nonglandular trichomes and usually 0.4-0.7 mm patent glandular trichomes; leaf blade 0.7-2.1 cm, palmately cleft, ratio of main sinus/middle segment length = 0.79-0.85, pilose with appressed nonglandular trichomes and adaxially with ± patent glandular trichomes; segments 5, obtriangular, 1-2 mm wide at base, 3-or 4(-7)-lobed in distal half, ratio of second sinus/middle segment length = 0.28-0.47. Cymules solitary, 2-flowered; peduncle 1.3-6.9 cm. Pedicel 1.1-4.2 cm, with 0.3-0.6 mm retrorse appressed nonglandular trichomes and rarely 0.2-0.3 mm patent glandular trichomes; bracteoles lanceolate. Sepals 6-7.6 mm, mucro 0.6-0.8 mm, ratio of mucro/sepal length = 0.09-0.11, outside with 0.2-0.7 mm antrorse ± appressed nonglandular trichomes and 0.7-1.6 mm patent glandular trichomes, inside glabrous. Petals deep pink, 1.1-1.4(-1.5) cm, erect to patent, both surfaces basally with trichomes, margin basally ciliate, apex rounded or slightly retuse with a 0.1-0.3 mm notch. Staminal filaments yellowish, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.4-1.1 mm; anthers yellowish, 1.4-1.7 mm. Nectaries 5, hemispheric, glabrous. Stigma red. Fruit 1.7-2 cm, reflexed when immature; mericarps smooth, with a basal callus, with 0.4-0.8 mm ± patent nonglandular trichomes and sometimes 0.4-0.5 mm glandular trichomes; rostrum 1-1.2 cm, with a 2.1-2.8 mm narrowed apex; stigmatic remains 3.1-3.8 mm. Seeds 1.8-1.9 mm. Fl. Jul-Aug, fr. Sep-Oct. 2n = 28*.
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