Ranunculus glaberrimus |
Ranunculus austro-oreganus |
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sagebrush buttercup, smooth buttercup |
southern Oregon buttercup |
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Roots | cylindric, 1-3 mm thick. |
never tuberous. |
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Stems | prostrate or ascending, 4-15 cm, glabrous, each with 1-4 flowers. |
erect or ascending, never rooting nodally, crisped-pilose, base not bulbous. |
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Basal leaves | persistent, blades reniform or obovate to very narrowly elliptic, 0.7-5.2 × 1-2 cm, base truncate, obtuse or attenuate, margins entire or with 3 broad, apical crenae, apex rounded to acute. |
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Basal leaf blades | broadly rhombic to semicircular in outline, 3-parted, 2.8-4.3 × 3-5.5 cm, segments 3-lobed, ultimate segments lanceolate, margins entire or toothed, apex narrowly acute or acuminate. |
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Flowers | pedicels glabrous or nearly so; receptacle glabrous; sepals 5-8 × 3-7 mm, abaxially glabrous or sparsely pilose, hairs colorless; petals 5-10, 8-13 × 5-12 mm; nectary scale glabrous or ciliate. |
receptacle glabrous; sepals reflexed 1 mm above base, 4-6 × 1.5-3 mm, densely pilose; petals 5, abaxially red, adaxially yellow, 10-12 × 4-6 mm. |
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Heads of achenes | globose, 7-12(-20) × 6-11(-20) mm; achenes 1.4-2.2 × 1.1-1.8 mm, usually finely pubescent; beak subulate or lance-subulate, straight or curved, 0.4-1 mm. |
hemispheric, 4-7 × 7-10 mm; achenes 3.4-4.2 × 2.8-3.2 mm, sometimes basally pilose, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lance-subulate, straight or somewhat curved distally, 1.6-2.6 mm. |
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Ranunculus glaberrimus |
Ranunculus austro-oreganus |
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Phenology | Flowering spring (May). | |||||
Habitat | Grassy hillsides | |||||
Elevation | 500 m (1600 ft) | |||||
Distribution |
AZ; CA; CO; ID; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; SK
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OR |
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Discussion | Varieties 2 (2 in the flora). Usually only a minority of the ovaries develop, and the fruiting receptacle is completely hidden by aborted ovaries. Populations growing at high elevations (Ranunculus glaberrimus var. ellipticus) and low elevations (var. glaberrimus) are usually well differentiated, but these varieties intergrade at intermediate elevations. The Thompson Indians rubbed the flowers or the whole plant of Ranunculus glaberrimus on arrow points as a poison (D. E. Moerman 1986). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Ranunculus austro-oreganus is doubtfully distinct from R. occidentalis var. howellii. L. D. Benson (1954) described the stem as bulbous-based and similar to that of R. bulbosus, but a differentiated base is not evident in material I have seen (some of which was cited by Benson). (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 | Hooker: Fl. Bor.-Amer. 1: 12. (1829) | L. D. Benson: Amer. Midl. Naturalist 52: 341. (1954) | ||||
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