E-Flora BC: Electronic Atlas of the Flora of British Columbia

Ranunculus flabellaris Raf.
yellow water-buttercup (yellow water buttercup; yellow water-crowfoot)
Ranunculaceae (Buttercup family)

Introduction to Vascular Plants

© RĂ©al Sarrazin  Email the photographer   (Photo ID #26695)

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Distribution of Ranunculus flabellaris
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Species Information

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Aquatic to amphibious, perennial herb, rooting from nodes of lower stems, roots fibrous, slender; stems coarse, freely-branched, floating or creeping, smooth, hollow.
Basal leaves rarely present; submerged stem leaves alternate, semicircular to kidney-shaped, 1-7 cm long, 2-11 cm wide, 1- to 6-times parted, lobed, or dissected, the segments entire or round-toothed, tips rounded to thread-like; floating stem leaves absent or unlike submerged, 3-lobed, lobes linear to oblong; stalks 0.5-4 cm long.
Inflorescence of 1- to few-flowered terminal and axillary cymes, on stout stalks to 10 cm long; receptacle sparsely stiff-hairy; petals 5-6, distinct, yellow, 7-12 mm long, 5-9 mm wide, nectary on upper surface, the nectary scale variable, 1.5 mm long; sepals 5, spreading or weakly bent back, early deciduous, 5-7 mm long, 3-6 mm wide, smooth; stamens 30-70; pistils 30-70.
Achenes, numerous in an egg-shaped head 8-10 mm long, 7-8 mm wide, the achenes egg-shaped, flattened, 1.8-2.2 mm long, 1.6-2.2 mm wide, smooth; beaks persistent, lanceolate, flattened, straight or somewhat curved at tip, 1-1.8 mm long.
This species is closely related to R. gmelinii.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Ponds and shorelines in the steppe, montane and subalpine zones; infrequent and scattered in S BC east of the Coast-Cascade Mountains; E to PQ and NB and S to KS, NC, LA, UT, NV and N CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Ranunculus flabellaris

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 7 864 2249
Slope Gradient (%) 0 2 43
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 120 160
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 6 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BG(1), CWH(8), ESSF(1), ICH(2), IDF(14), IMA(1), MS(6), PP(1), SBPS(1), SBS(6)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is cool temperate & cool mesothermal.

Synonyms and Alternate Names

Ranunculus delphiniifolius Torr. ex Eat.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References