Ranunculus alismifolius |
Ranunculus fasciculatus |
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common water plantain buttercup, kidney-leaf buttercup, plantain-leaf buttercup, water-plantain buttercup |
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Roots | slender or fusiform-thickened basally, glabrous. |
fleshy and somewhat tuberous. |
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Stems | erect or ascending, not rooting nodally, glabrous or hirsute. |
erect or decumbent, not rooting nodally, hirsute to nearly glabrous, base not bulbous. |
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Leaves | basal leaf blades with base acute; proximal cauline leaf blades lanceolate, ovate, or elliptic, 1.8-14.1 × 0.7-2.9 cm, base acuminate to rounded, margins entire or serrulate, apex obtuse to acuminate. |
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Basal leaf | blades ovate to deltate in outline, 3(-5)-foliolate, 2.5-14.9 × 2.3-19.9 cm, leaflets 1-2x-lobed or -parted, ultimate segments narrowly oblong to elliptic or lanceolate, margins toothed, apex narrowly acute to rounded-acute. |
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Inflorescences | bracts lanceolate. |
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Flowers | receptacle glabrous; sepals 5, spreading or reflexed from base, 2-6 × 1-4 mm, glabrous or hirsute; petals 5-12, 5-14 × 2-8 mm; nectary scales glabrous. |
receptacle hispid; sepals reflexed 1-2 mm above base, 5-10 × 3-5 mm, hispid; petals 11-16, yellow, 8-21 × 2-5 mm. |
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Heads of achenes | hemispheric to globose, 3-7 × 4-8 mm; achenes 1.6-2.8 × 1.2-2 mm, glabrous or rarely hispid; beak lance-subulate, straight or weakly curved, 0.4-1.2 mm. |
globose to ovoid, 6-13 × 7-9 mm; achenes 2.4-3.4 × 2-2.4 mm, glabrous, margin forming rib or narrow wing 0.1-0.4 mm wide; beak filiform from deltate base, straight, 1.8-2.5 mm, filiform tip often deciduous, leaving 1-1.2 mm deltate beak. |
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Ranunculus alismifolius |
Ranunculus fasciculatus |
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Phenology | Flowering late spring–summer (Jun–Aug). | |||||||||||||||||||||
Habitat | Stream banks, lakeshores, and marshes | |||||||||||||||||||||
Elevation | 1000-2200 m (3300-7200 ft) | |||||||||||||||||||||
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; BC
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AZ; TX; Mexico |
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Discussion | Varieties 6 (6 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
I am following G. L. Nesom (1993) in treating Ranunculus fasciculatus as a distinct species. This taxon was considered a variety of R. macranthus by L. D. Benson (1948) and a variety of R. petiolaris by T. Duncan (1980). These disparate opinions result from different interpretations of Mexican members of the R. petiolaris group. (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. Flammula | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | ||||||||||||||||||||
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Subordinate taxa | ||||||||||||||||||||||
Synonyms | R. macranthus var. arsenei, R. petiolaris | |||||||||||||||||||||
Name authority | Geyer ex Bentham: Pl. Hartw., 295. (1849) | Sessé & Moçiño: Fl. Mexic. ed. 2, 134. (1894) | ||||||||||||||||||||
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