Ranunculus orthorhynchus |
Ranunculus orthorhynchus var. bloomeri |
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Bloomer's buttercup, straight-beak buttercup, swamp buttercup |
Bloomer's buttercup |
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Roots | sometimes fleshy and ± tuberous. |
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Stems | nearly erect or decumbent, never rooting nodally, hispid, strigose, or glabrous, base not bulbous. |
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Basal leaf | blades narrowly ovate to oblong or semicircular in outline, simple to 3-5-lobed or -foliolate, 2.8-12.5 × 2.5-14 cm, leaflets or segments undivided or 1-2x-lobed or -parted, ultimate segments circular to linear, margins dentate, crenate, or entire, apex rounded to narrowly acute. |
blades cordate to oblong or circular in outline, simple and undivided or 3-foliolate, if compound the leaflets undivided, margins crenate, apices rounded to obtuse or occasionally acute. |
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Flowers | receptacle hispid; sepals reflexed 1-2 mm above base, 5-11 × 2-4 mm, hispid, hirsute, or glabrous; petals 5-6, abaxially yellow or red, adaxially yellow, 8-18 × 4-11 mm. |
petals abaxially yellow, 6-9 mm broad, retuse. |
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Heads of achenes | hemispheric to ovoid, 5-13 × 6-10 mm; achenes 2.8-4.5 × 1.8-3.2 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, narrowly lanceolate to subulate, straight, 1.8-3.8(-4.8) mm. |
hemispheric to ovoid, 7-9 mm; beak 1.8-2.2 mm. |
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2n | = 32. |
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Ranunculus orthorhynchus |
Ranunculus orthorhynchus var. bloomeri |
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Phenology | Flowering late winter–spring (Mar–May). | |||||||||
Habitat | Meadows and marshy areas | |||||||||
Elevation | 0-1500 m (0-4900 ft) | |||||||||
Distribution |
AK; CA; ID; MT; NV; OR; UT; WA; WY; BC
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CA; OR |
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Discussion | Varieties 3 The first two varieties (Ranunculus orthorhynchus var. orthorhynchus and R. orthorhynchus var. platyphyllus) are rather weak, intergrading extensively in California and Oregon. By contrast, R. orthorhynchus var. bloomeri often grows with the others with little or no intergradation (although intermediate populations are found in some areas), and it has been treated as a distinct species, R. bloomeri, by many taxonomists. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Ranunculus orthorhynchus var. bloomeri is disjunct between the Coast Ranges of west-central California and south-central Oregon. (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. Ranunculus > Ranunculus orthorhynchus | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | R. bloomeri | |||||||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 21. (1829) | (S. Watson) L. D. Benson: Amer. Midl. Naturalist 40: 101. (1948) | ||||||||
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