Annuals. Stem 9-37 cm tall, erect or ascending, not rooting at nodes, with 0.4-2.4 mm patent nonglandular trichomes, 0.1-0.3 mm uncinate nonglandular trichomes, and usually 0.2-0.4 mm patent glandular trichomes. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.5-2.7 mm patent nonglandular trichomes, 0.1-0.3 mm uncinate nonglandular trichomes, and usually 0.2-0.3 mm patent glandular trichomes; leaf blade 1.3-6.7 cm, palmately cleft, ratio of main sinus/middle segment length = 0.63-0.83, pilose with ± appressed nonglandular and glandular trichomes; segments 5-7, rhombic, 3-11 mm wide at base, 3-19-lobed in distal half, ratio of second sinus/middle segment length = 0.14-0.29. Cymules solitary, (1 or)2-flowered, sometimes grouped at nodes with short or no peduncles; peduncle (0-)1-9.4 cm. Pedicel 0.5-2.2 cm, with 0.1-0.3 mm patent to uncinate nonglandular trichomes and usually 0.3-0.5 mm patent glandular trichomes; bracteoles lanceolate. Sepals 3.4-7.2 mm, mucro 0.2-1 mm, ratio of mucro/sepal length = 0.05-0.21, outside with 0.1-2.2 mm ± patent nonglandular trichomes and 0.3-0.6 mm patent glandular trichomes, inside glabrous. Petals purplish with a dark basal spot, 3.1-7.5 mm, erect to patent, both surfaces glabrous, margin basally ciliate, apex rounded. Staminal filaments white with dark purplish apex, lanceolate, glabrous; anthers purplish, 0.7-1.1 mm. Nectaries 5, hemispheric, glabrous. Stigma dark purplish. Fruit 1-1.7 cm, erect when immature; mericarps transversely wrinkled, without a basal callus, glabrous; rostrum 0.8-1.4 cm, without a narrowed apex; stigmatic remains 0.2-0.7 mm. Seeds 1.3-2.4 mm. Fl. Feb-Apr, fr. Apr-May. 2n = 56.
Flowers mostly chasmogamous but those on lower stem portion usually cleistogamous; pedicels 2–20 mm. long, pubescent and sometimes glandular; bracts linear-lanceolate, 2–4 mm. long, hyaline at the edge, pubescent.
Sepals lanceolate, 4–5.5 mm. long, 1–3 mm. wide, mucronate, 3-nerved, hyaline at the edge, pubescent to pilose or glandular.
Inflorescence 2-flowered; peduncle up to 5 cm. long, but frequently very short or lacking, the flowers then solitary, glandular.
Mericarps with shallow reticulate ridges, glabrous or shortly pubescent; mature rostrum 8–14 mm. long, pubescent; upper portion of the style 0–2 mm. long.
Annual prostrate-ascending herb up to 7 dm. long/tall, diffusely branched from below; stems longitudinally grooved, mostly covered with spreading hairs or glands up to 2 mm. long, usually very weak but rather woody at the very base.
Ovary pubescent; stigmas 0.3–1 mm. long, dark purple.
Stamens: filaments narrowly lanceolate or acicular, 2–3 mm. long, purple; anthers 0.6–0.9 mm. long, 0.3–0.5 mm. wide, purple.
Petals obovate to broadly spathulate, 6–7.8 mm. long, 3.5–5 mm. wide, obtuse, purple-pink with distinct purple centre.
Leaves generally opposite, sometimes alternate towards the base; lamina 5-lobed, divided to about two-thirds of the radius; lobes 3–10 mm. wide at the base, obovate in outline, pinnatifid, pubescent on both surfaces, usually also hispid with scattered hairs on the upper surface; petiole 0.5–9 cm. long, longitudinally grooved, covered with spreading hairs or glands; stipules divided nearly to the base into lanceolate segments, 2–4 mm. long, pubescent or pilose.
Seeds 2–2.5 mm. long, 1–1.5 mm. wide, glabrous; testa minutely foveolate, pubescent along the minute ridges, with sharp beak, brown to almost black.
Leaf-lamina 5-lobed, divided to about 2/3; lobes 3–10 mm. across at base, obovate in outline, pinnatifid, pubescent both above and below, usually hispid with scattered hairs on the upper surface also; petioles 5–90 mm. long, longitudinally furrowed, covered with spreading hairs or glands; stipules 2–4 mm. long, lacerated nearly to the base into lanceolate segments, pubescent or pilose.
Annual herb; stems prostrate-ascendent, longitudinally furrowed, mostly covered with spreading hairs or glands up to 2 mm. in length.
Petals about 7 × 5 mm., obovate, purple-pink with distinct dark purple centre.
Stamens 10, filaments about 3 mm. long, narrowly lanceolate.
Inflorescence 2-flowered; peduncle 0–5 cm. long, glandular; pedicels 2–20 mm. long, glandular; bracts 2–4 mm. long, linear-lanceolate, hyaline at the edge, pubescent; sepals 5 × 2–3 mm., lanceolate, mucronate, 3-nerved, hyaline at the edge, pubescent, pilose or glandular.
Cocci with shallow reticulate ridges, glabrous or shortly pubescent; mature rostrum 8–14 mm. long, pubescent; upper portion of the styles 0–2 mm. long, stigmas 0·3–1 mm. long.