Common name: Small River Buttercup
Ranunculus amphitrichus Colenso APNI* Synonyms: Ranunculus rivularis Banks & Sol. ex DC. APNI*
Description: Glabrous or very sparsely pilose aquatic perennial, often with floating leaves and emergent flowers; stolons often with corm-like swellings at nodes.
Flowering stems 7–35 cm long, simple or branched, often recurved below the flower.
Leaves with lamina thin-textured, ± circular in outline, 1–10 cm diam., cut into few or numerous obtuse or subacute lobes; petiole 5–24 cm long. Flowers 7–10 mm diam. Sepals spreading. Petals 5 or rarely more, narrow-oblanceolate or oblong with cuneate base, 3–5 mm long, 0.8–1.8 mm wide, pale golden-yellow.
Achenes 10–25, 1.6–2.2 mm long, lateral faces obscurely wrinkled. Receptacle at fruit stage densely pilose with short hairs among the stamens, usually glabrous among achenes.
Flowering: spring to summer.
Distribution and occurrence: SC CT ST; Vic., Tas., N.Z.
NSW subdivisions: SC, NT, CT, ST
Other Australian states: Vic. Tas.
The name R. rivularis long used for this species is not correct. Ref. Garnock-Jones (1986b).
Text by B. G. Briggs & R. O. Makinson
Taxon concept: Flora of NSW 1 (1990)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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