Ranunculus sessiliflorus R.Br. ex DC.

Annual Buttercup

Syst. Nat. 1: 302 (1817) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Short-lived annual, stems ascending to erect, 2–40 cm long, variably pilose to almost glabrous. Leaves of juvenile plants broadly 3–5-lobed to palmatifid, adult leaves shallowly to deeply 3–5-lobed or palmatisect, the lobes or segments toothed or again divided, usually 0.5–2 cm long and wide overall; petioles mostly 1–3(–10) cm long. Flowers 2–3 mm diam., sessile or subsessile, rarely pedicels elongating to c. 0.5 cm long in fruit; sepals 3–4, oblong to elliptic, c. 2 mm long, pilose on back; petals 1 or 2, c. spathulate or oblong, slightly shorter than sepals, pale yellow-green; nectary attached at or slightly above middle, lobe minute, triangular to obovate, fused with petal along margins; stamens usually 3(–6). Achenes c. 10–20, ovate or orbicular, 1.5–2 mm long, flat to slightly biconvex, the faces with scattered tubercles, each terminated by a hooked bristle no longer than the diameter of the tubercle itself; beak acute, c. 0.3–0.5 mm long; receptacle glabrous. .

Brid, CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HNF, HSF, LoM, MonT, MuF, MuM, NIS, OtP, OtR, SnM, Strz, VAlp, VRiv, VVP, WaP, Wim.

2 imperfectly separated varieties.

Source: Walsh, N.G. (1996). Ranunculaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2018-12-03

Melville, R. (1956). Contributions to the Flora of Australia: III. The Ranunculus sessiliflorus complex in Australia, Kew Bulletin 11(2): 277-286.

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Distribution map


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Ranunculus sessiliflorus in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Ranunculus sessiliflorus in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Glenelg Plain present native
Bridgewater present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory