in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 522. 1836.
Plants 10–20 (–30+) cm. Stems decumbent to erect. Leaf-blades oval to lyrate, 10–30 (–45) mm, faces ± pilosulous to sparsely sericeous, glanddotted. Fruits strongly compressed, ± cuneate, 2–3 (–4) mm, usually 3-ribbed, terminal spines 2, divergent, 2–3 (–4) mm, often 1 ± uncinate, prickles ± uncinate, mostly along 2 ribs and around apices.
Phenology: Flowering all year.
Habitat: Disturbed, often sandy sites
Elevation: 0–10+ m
Introduced; Ala., Fla., S.C., West Indies, also in Central America, South America