Ranunculus bonariensis var. trisepalus

Stems erect or decumbent, rooting at proximal nodes, glabrous. Roots not thickened basally, glabrous. Proximal cauline leaf blades elliptic to ovate, 0.8-2.3 × 0.5-1.2 cm, base rounded or obtuse, margins entire to finely denticulate, apex broadly rounded-acute to rounded. Inflorescences: bracts elliptic to ovate. Flowers: receptacle glabrous; sepals 3, spreading or reflexed from base, 1.5-3 × 0.5-2 mm, glabrous; petals 1-3, 1.5-2.5 × 0.5-1 mm; nectary scales glabrous. Heads of achenes globose to ovoid, 2-5 × 2-4 mm; achenes 1.4-1.8 × 1-1.2 mm, smooth, glabrous; beak absent.

Flowering spring (Mar-May). Vernal pools and edges of streams; 30-1000 m; Calif.; South America.