- = Ranunculus incisus Hook.f. (1852)
- = Ranunculus rivularis var. major Benth. (1863)
- ≡ Ranunculus rivularis var. inundatus (R.Br. ex DC.) Rodway (1903)
- = Ranunculus inundatus R.Br. ex DC. pro parte
Perennial with rosettes tufted along a slender creeping rhizome usually with swollen nodes. Basal lvs on slender erect or ascending petioles 5–15–(25) cm long; lamina ternate or occasionally palmate, usually with at least 1–2 hairs, sometimes more, ± circular, or slightly broader than long, 1–3–(5) cm diam.; leaflets sessile, divided again to at least 1/2 way, sometimes again toothed, ± equal, the lateral leaflets sometimes divided to base; lvs of flowering stems smaller with 1–3 linear, acute, entire segments. Fls 1–3–(5) per stem, or solitary fls rarely sessile, 12–15–(20) mm diam.; pedicels glabrous. Sepals ± recurved, glabrous or hairy. Petals 5–10, yellow, narrowly obovate, shortly clawed; nectary single, 1–2 mm from petal base, pocket-like. Receptacle glabrous. Achenes 5–20, hardly flattened, glabrous; body 2–2.5 mm long; style straight or curved, 1.5–2 mm long.
[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]