Citation: Banks & Sol. ex DC., Reg. Veg. Syst. Nat. 1:270 (1817).

Synonymy: Not Applicable

Common name: River-buttercup, small river-buttercup.

Description:
Perennial herb, sometimes submerged, with slender stolons rooting and clustered leaves at the nodes; basal leaves petiolate; blades roundish, ternate or deeply trilobed, glabrous, when submerged in deep water the segments narrow-linear-oblong with blunt tips, when aerial on damp soil with broader segments, the segments cuneate to obovate and again 3-lobed.

Flowers 3-5 mm diam.; sepals 4 or 5, deeply concave, spreading, sometimes later almost reflexed, glabrous; petals 5-9, linear, strap-shaped to oblanceolate, 3-4 mm long, 0.7-1.2 mm wide, slightly contracted into a claw below the nectary, 3-nerved, the centre nerve sometimes (rarely also the lateral nerves) forked in the upper half; nectar an inflated semilunar pocket or bracket, about one-third of the petal length above the base; stamens c. 15.

Carpels c. 10; achenes sublenticular, c. 2 mm long, body somewhat swollen, obscurely rugose; beak slender, almost as long as the achene body; torus often with a ring of stiff hairs in the staminal zone, glabrous or with a few hairs between the achenes.

	Ranunculus rivularis
Image source: fig 198e in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Cochrane et al. (1968) Flowers and plants of Victoria, fig. 259.

Distribution:  In swamps and shallow water.   N.S.W.; Vic.; Tas.   New Zealand. Conservation status: native Flowering time: all months.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Taxonomic notes: The name R. rivularis DC. is illegitimate, being a later homonym. The correct name of this species is presently under investigation by P. J. Garnock-Jones (Christchurch, New Zealand) and Yvonne Menadue (Hobart).

Author: Not yet available