Ranunculus rhomboideus |
Ranunculus orthorhynchus |
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Labrador buttercup, prairie buttercup, prairie crowfoot |
Bloomer's buttercup, straight-beak buttercup, swamp buttercup |
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Roots | slender, 0.8-1.8 mm thick. |
sometimes fleshy and ± tuberous. |
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Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
nearly erect or decumbent, never rooting nodally, hispid, strigose, or glabrous, base not bulbous. |
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Basal leaves | persistent, blades ovate to rhombic, undivided or rarely innermost 3-parted, 1.1-5.3 × 0.9-3.6 cm, base obtuse, margins crenate with 5 crenae, apex rounded. |
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. |
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Flowers | pedicels pilose; receptacle pilose; sepals 4-6 × 1.5-3 mm, abaxially pilose, hairs colorless; petals 5, 6-8 × 2-4 mm; nectary scale glabrous. |
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. |
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Heads of achenes | depressed-globose, 4-6 × 5-7 mm; achenes 1.8-2.2 × 1.2-1.8 mm, glabrous; beak slender, curved, 0.2-0.3 mm. |
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. |
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2n | = 16. |
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Ranunculus rhomboideus |
Ranunculus orthorhynchus |
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Phenology | Flowering spring (Apr–Jun). | |||||||||
Habitat | Prairies, or occasionally open woods or thickets | |||||||||
Elevation | 0-900 m (0-3000 ft) | |||||||||
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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AK; CA; ID; MT; NV; OR; UT; WA; WY; BC
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Discussion | In addition to the range given above, L. D. Benson (1948) cited nineteenth-century specimens from Quebec, New York, Massachusetts, and Rhode Island. No modern specimens have been seen from those areas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Hooker: Fl. Bor.-Amer. 1: 21. (1829) | ||||||||
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