Ranunculus orthorhynchus |
Ranunculus pallasii |
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Bloomer's buttercup, straight-beak buttercup, swamp buttercup |
Pallas' buttercup, renoncule de Pallas |
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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. |
creeping or floating, rooting nodally, glabrous, not bulbous-based. |
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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 linear to obovate, undivided or 3-lobed, 1.5-3.6 × 0.3-2 cm, lobes lanceolate or elliptic, margins entire, apex rounded to acuminate. |
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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. |
receptacle glabrous; sepals spreading, 6-10 × 4-7 mm, glabrous; petals 7-11, white or pink, 8-13 × 3-6 mm. |
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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. |
globose or hemispheric, 5-12 × 9-15 mm; achenes 4.2-5.2 × 2.4-3.2 mm, glabrous; beak persistent, lanceolate, straight or curved, 1-1.2 mm. |
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Tuberous | roots absent. |
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2n | = 32. |
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Ranunculus orthorhynchus |
Ranunculus pallasii |
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Phenology | Flowering summer (Jul–Aug). | |||||||||
Habitat | Shallow water of bogs and pools in muskeg and tundra | |||||||||
Elevation | 0-700 m (0-2300 ft) | |||||||||
Distribution |
AK; CA; ID; MT; NV; OR; UT; WA; WY; BC
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AK; MB; NF; NT; ON; QC; YT; Eurasia |
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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. Pallasiantha | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 21. (1829) | Schlechtendal: Animadv. Bot. Ranunc. Cand. 1: 15. (1819) | ||||||||
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