Ranunculus orthorhynchus |
Ranunculus allenii |
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Bloomer's buttercup, straight-beak buttercup, swamp buttercup |
Allen's buttercup, renoncule d'Allen |
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Roots | sometimes fleshy and ± tuberous. |
slender, 0.2-0.8 mm thick. |
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Stems | nearly erect or decumbent, never rooting nodally, hispid, strigose, or glabrous, base not bulbous. |
erect or ascending, 5-19 cm, sparsely pilose, each with 1-4 flowers. |
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Basal leaves | 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. |
persistent, blades reniform or semicircular, undivided or some 3-parted, 1.4-2.1 × 1.7-2.8 cm, base cordate or truncate, margins crenate with more than 5 crenae, apex rounded. |
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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. |
pedicels pilose, sometimes sparsely so; receptacle hispid; sepals 4-6 × 2-3 mm, abaxially pilose, hairs colorless; petals 5, 4-5 × 2-4 mm; nectary scale glabrous. |
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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. |
ovoid to cylindric, 4-7 × 4-6 mm; achenes 1.6-1.8 × 1.2-1.4 mm, glabrous; beak lance-subulate, curved, 0.4-0.6 mm. |
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2n | = 32. |
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Ranunculus orthorhynchus |
Ranunculus allenii |
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Phenology | Flowering summer (Jul–Aug). | |||||||||
Habitat | Wet alpine meadows, often around late snowbeds, shores of lakes and streams | |||||||||
Elevation | 700-1300 m (2300-4300 ft) | |||||||||
Distribution |
AK; CA; ID; MT; NV; OR; UT; WA; WY; BC
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NF; NT; QC |
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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.) |
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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. Epirotes | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 21. (1829) | B. L. Robinson: Rhodora 7: 220. (1905) | ||||||||
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