Ranunculus canus |
Ranunculus flabellaris |
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Hartweg's buttercup, Sacramento Valley buttercup |
greater yellow water crowfoot, renoncule à évantails, water buttercup, yellow water-buttercup, yellow water-crowfoot |
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Roots | never tuberous. |
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Stems | erect to decumbent, never rooting nodally, hirsute, pilose, or glabrous, base not bulbous. |
floating or prostrate, glabrous, rooting at proximal nodes. |
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Leaves | basal leaves seldom present, cauline leaf blades semicircular to reniform, 1-6x-lobed, parted, or dissected 1.2-7.3 × 1.9-10.8 cm, base truncate or cordate, segment margins entire or crenate, apex rounded to filiform. |
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Basal leaf | blades ovate to narrowly ovate in outline, 3-parted or -foliolate, 3.3-9.5 ×3.5-9.4 cm, leaflets or segments 1-3x-lobed, ultimate segments ovate or oblong-ovate to lanceolate, margins toothed, apex acute or obtuse. |
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Flowers | receptacle glabrous; sepals reflexed 1-2 mm above base, 3-8 × 2-4 mm, hirsute; petals 5-17, yellow, 6-12 × 3-6 mm. |
receptacle sparsely hispid; sepals 5, spreading or weakly reflexed, 5-7 × 3-6 mm, glabrous; petals 5-6(-14), 7-12 × 5-9 mm; nectary scale variable, crescent-shaped, funnel-shaped, or flaplike; style 0.8-1.2 mm. |
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Heads of achenes | hemispheric to globose, 6-9 × 7-10 mm; achenes 3.4-4.4 × 2.4-3.6 mm, glabrous or rarely hispid, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, deltate or lance-deltate, curved, 0.2-1.2 mm. |
ovoid, 8-10 × 7-8 mm; achenes 1.8-2.2 × 1.6-2.2 mm, glabrous; beak lanceolate, straight, 1-1.8 mm. |
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2n | = 32. |
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Ranunculus canus |
Ranunculus flabellaris |
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Phenology | Flowering late spring–summer (May–Aug). | |||||
Habitat | Shallow water or drying mud | |||||
Elevation | 0-1500 m (0-4900 ft) | |||||
Distribution |
CA
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AL; AR; CA; CT; DE; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NV; NY; OH; OK; OR; PA; RI; SD; TN; TX; UT; VA; VT; WA; WI; WY; AB; BC; MB; NB; ON; QC
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Discussion | Varieties 2 (2 in the flora). Ranunculus canus intergrades with R. occidentalis var. occidentalis and R. californicus, and some populations can be difficult to assign to species. The deltate or lance-deltate achene beak of R. canus, however, which is usually 0.8-1.2 mm wide at the base and less than 1.5 times as long as wide, contrasts with the narrower beaks of the other two species, which are usually less than 0.6 mm wide and at least twice as long as wide. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The Fox tribes used Ranunculus flabellaris as a cold remedy and a respiratory aid (D. E. Moerman 1986). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Hecatonia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | R. delphinifolius | |||||
Name authority | Bentham: Pl. Hartw., 294. (1849) | Rafinesque: Amer. Monthly Mag. & Crit. Rev. 2: 344. (1818) | ||||
Web links |
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