Perennials. Rootstock ± horizontal, 1-1.1 cm in diam., not tuberculate, with many fibrous roots. Stem 80-85 cm tall, erect, not rooting at nodes, with 0.3-0.4 mm patent to retrorse nonglandular trichomes. Stipules lanceolate, connate at least at base. Leaves opposite; petiole with 0.2-0.5 mm patent nonglandular trichomes and sometimes 0.8-1.1 mm patent glandular trichomes; leaf blade 9-10.9 cm, palmately cleft, ratio of main sinus/middle segment length = 0.76-0.84, pilose with appressed nonglandular trichomes; segments 5 or 7, rhombic, 1.3-2 cm wide at base, 17-21-lobed in distal half, ratio of second sinus/middle segment length = 0.05-0.18. Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle 1.4-9.5 cm. Pedicel 1.8-2.6 cm, with 0.3-0.5 mm patent nonglandular trichomes and 0.4-1.9 mm patent glandular trichomes; bracteoles linear-lanceolate. Sepals 7.2-7.8 mm, mucro 0.4-1.5 mm, ratio of mucro/sepal length = 0.05-0.18, outside with 0.3-0.4 mm antrorse ± appressed nonglandular trichomes and 0.4-1.6 mm patent glandular trichomes, inside glabrous. Petals whitish, 7.3-8.6 mm, reflexed, both surfaces glabrous, margin basally with a dense tuft of trichomes, apex rounded. Staminal filaments reddish, lanceolate, abaxially sparsely pilose and proximal half ciliate, trichomes 2.1-2.9 mm; anthers bluish, 2.4-2.7 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma green. Fruit 2.4-2.9 cm, erect when immature; mericarps smooth, with a basal callus, with 0.5-0.7 mm ± patent nonglandular trichomes and 0.3-0.9 mm patent glandular trichomes; rostrum 1.8-2.2 cm, with a 5-6 mm narrowed apex; stigmatic remains 1.7-1.8 mm. Seeds 1.9-2 mm. Fl. Jun-Jul, fr. Jul-Aug.
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