Perennials. Rootstock ± horizontal, 0.7-1.8 cm in diam., not tuberculate, with thickened roots along rootstock. Stem 23-85 cm tall, erect, not rooting at nodes, with 0.2-0.7 mm retrorse to patent nonglandular trichomes and rarely 1-1.1 mm patent glandular trichomes. Stipules lanceolate, connate at least at base. Leaves opposite; petiole with 0.3-0.6 mm patent to retrorse nonglandular trichomes and rarely 0.4-0.5 mm patent glandular trichomes; leaf blade 3.2-10.2 cm, palmately cleft, ratio of main sinus/middle segment length = 0.81-0.93, pilose with appressed nonglandular trichomes; segments 5, rhombic, 3.4-11 mm wide at base, 9-26-lobed in distal half, ratio of second sinus/middle segment length = 0.13-0.32. Cymules solitary or in aggregates at apex of each branch, 2-flowered; pedun cle 2-11.9 cm. Pedicel 0.7-3.4 cm, with 0.2-0.5 mm patent to retrorse nonglandular trichomes and sometimes 0.9-2.1 mm patent glandular trichomes; bracteoles filiform. Sepals 6.5-10 mm, mucro 0.9-2.6 mm, ratio of mucro/sepal length = 0.12-0.34, outside with 0.3-1.1 mm antrorse ± appressed nonglan dular trichomes and sometimes 0.6-2.2 mm patent glandular trichomes, inside glabrous. Petals blackish red to pink with a whitish base, (6.1-)8-9.8(-12.3) mm, reflexed, basally with trichomes sometimes outside and also usually inside, margin basally with a dense tuft of trichomes, apex rounded. Staminal filaments reddish, lanceolate, abaxially sparsely pilose and proximal half ciliate, trichomes 0.3-1.2 mm; anthers blackish, 1.9-2.5 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma reddish. Fruit 2.4-3 cm, nodding when immature; mericarps smooth, with a basal callus, with 0.2-0.8 mm ± patent nonglandular trichomes; rostrum 1.7-2.2 cm, with a 3.6-6.2 mm narrowed apex; stigmatic remains 1.8-3.4 mm. Seeds 2.2-2.8 mm. Fl. Jun-Aug, fr. Aug-Oct.
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