Ranunculus diminutus B.G.Briggs

Stoloniferous perennial. Leaves with petioles 2–10 (–12) cm long; lamina trifoliolate, 0.5–2 cm long and wide; segments oblong to narrowly elliptic, entire or with 2 or 3 lobes or teeth. Flowering stems 1–10 cm long, 1 (–3)-flowered. Sepals 5–8, spreading, ovate to broadly elliptic, 3–5 mm long, glabrous or sparsely pilose. Petals oblong to obovate, 3–6.5 mm long, 0.6–1.5 mm long, bright yellow; nectary near petal-base, pocket-like, with lobe c. 0.5 mm long, with apex shallowly emarginate, truncate, or shortly rounded. Stamens 15–30. Pistils 6–30. Receptacle sparsely hispid. Achenes flattened-obovoid, 1–1.8 mm long; lateral faces smooth or finely wrinkled or obscurely ridged; beak slender, erect, c. 1 mm long.

Grows in seasonally inundated clay soils or muds, often subsaline, often derived from basalt.