Annuals. Stem 20-50 cm tall, erect, not rooting at nodes, with 1-3 mm patent nonglandular trichomes and 0.2-0.5 mm patent glandular and nonglandular trichomes. Stipules lanceolate, distinct. Leaves alternate; petiole with 1-2.8 mm patent nonglandular trichomes and 0.2-0.5 mm glandular and nonglandular trichomes; leaf blade 2.5-7 cm, palmately cleft, ratio of main sinus/middle segment length = 0.65-0.85, pilose with ± appressed nonglandular and glandular trichomes; segments 5(or 7), rhombic, 4-9 mm wide at base, 7-12(-15)-lobed in distal half, ratio of second sinus/middle segment length = 0.16-0.26. Cymules solitary, 2-flowered; peduncle 0.6-3.5 cm. Pedicel 1-2.8 cm, with 1-2.5 mm patent nonglandular trichomes and 0.2-0.5 mm patent glandular and nonglandular trichomes; bracteoles lanceolate. Sepals 4-4.5 mm, mucro 0.7-1 mm, ratio of mucro/sepal length = 0.17-0.22, outside with 0.2-0.8 mm patent nonglandular trichomes and 0.3-0.7 mm patent glandular trichomes, inside glabrous. Petals bright purple, 4-6.5 mm, erect to patent, margin basally ciliate or not, apex emarginate with a ca. 1 mm notch. Staminal filaments white, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.1-0.2 mm; anthers purple, 0.4-0.6 mm. Nectaries 5, hemispheric, glabrous. Stigma pale pink. Fruit 7-11 mm, erect when immature; mericarps with 3 or 4 transverse ribs, without a basal callus, with 0.2-0.5 mm appressed nonglandular trichomes, base not ciliate; rostrum 5-8 mm, without a narrowed apex; stigmatic remains 0.5-1 mm. Seeds 2.4-2.6 mm. Fl. May-Jun, fr. Jun-Jul. 2n = 28.
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