R. Br. ex DC., Reg. Veg. Syst. Nat. 1:269 (1817).
Synonymy: Ranunculus rivularis
Common name: River-buttercup.
Perennial herb, 5-30 cm high, stoloniferous; basal leaves palmatisect, 1-4 cm wide, with segments 0.5-2 mm wide, glabrous; petioles 1-15 cm long, glabrous or with a few flexible hairs; basal sheaths more or less pilose; cauline leaves palmatisect to trisect.
Flowering stems slender, erect, with 1-3 flowers, glabrous or pilose at the base; vegetative stems creeping, rooting at the nodes; flowers 1-1.5 cm diam.; sepals 5, elliptic to almost round, concave, glabrous; petals 5-7, narrowly obovate to oblanceolate-elliptic, apex rounded; nectary very near the base, with a semicircular to tongue-shaped lobe to 1 mm long, its lateral margins attached for the lower one-third to half its length; stamens c. 25-30; carpels c. 20-30.
Mature achenes almost lenticular, c. 1.5-1.8 mm long; beak reflexed, about half to two-thirds as long as achene-body; lateral faces with obscure irregular warty ridges and a broad flattened area at the base of the style; torus with a dense ring of short hairs in the staminal zone, glabrous between the achenes.
Image source: fig 197b in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).|
Cunningham et al. (1982) Plants of western New South Wales, p. 309.
Usually grows in shallow water with the leaves floating or submerged.
S.Aust.: MU, SL, SE. Qld; N.S.W.; Vic.; Tas.
Flowering time: Sept. — Jan.
SA Distribution Map based
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specimens held in the
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