Ranunculus cooleyae |
Ranunculus macounii |
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Cooley's buttercup |
Macoun's buttercup, renoncule de Macoun |
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Roots | never tuberous. |
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Stems | erect from short caudices, not rooting nodally, glabrous, not bulbous-based. |
prostrate to nearly erect, often rooting nodally, hirsute or glabrous, base not bulbous. |
Basal leaf | blades circular to reniform in outline, 3-5-parted, 0.8-3.8 × 1.7-6.9 cm, segments again lobed, ultimate segments elliptic or oblong, margins crenate, apex rounded; cauline leaf 0-1, scalelike. |
blades cordate to reniform in outline, 3-foliolate, 3.7-7.5 × 4.5-9.5 cm, leaflets 3-lobed or -parted, ultimate segments elliptic or lance-elliptic, margins toothed or lobulate, apex acute to broadly acute. |
Flowers | receptacle glabrous; sepals spreading, yellow, 7-11 × 4-7 mm, glabrous; petals 11-15, yellow, 8-12 × 3-5 mm. |
receptacle hirsute; sepals spreading or reflexed ca. 1 mm above base, 4-6 × 1.5-3 mm, glabrous or hirsute; petals 5, yellow, 4-6 × 3.5-5 mm. |
Heads of achenes | hemispheric or spheric, 7-8 × 9-10 mm; achenes 2.4-4.6 × 1.2-2.2 mm, glabrous; beak persistent, filiform, hooked distally, 1-1.8 mm. |
globose or ovoid, 7-11 × 7-10 mm; achenes 2.4-3 × 2-2.4 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lanceolate to broadly lanceolate, straight or nearly so, 1-1.2 mm. |
Tuberous | roots absent. |
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2n | = 16. |
= 32, 48. |
Ranunculus cooleyae |
Ranunculus macounii |
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Phenology | Flowering late spring–summer (Jun–Aug). | Flowering spring–summer (May–Sep). |
Habitat | Slopes near persistent snowbanks | Meadows, depressions in woodlands, ditches, edges of streams and ponds, on wet soil or emergent from shallow water |
Elevation | 500-1800 m (1600-5900 ft) | 0-2900 m (0-9500 ft) |
Distribution |
AK; WA; BC
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AK; AZ; CA; CO; ID; MI; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; NF; NT; ON; QC; SK; YT
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Discussion | Through most of its range, Ranunculus macounii has conspicuously hispid herbage. Glabrous plants are found, however, in the lower Columbia River valley (southwestern Washington and adjacent Oregon). This variant has been called R. macounii var. oreganus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Cyrtorhyncha > sect. Arcteranthis | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus |
Sibling taxa | ||
Synonyms | Arcteranthis cooleyae, Kumlienia cooleyae | R. macounii var. oreganus |
Name authority | Vasey & Rose ex Rose: Contr. U.S. Natl. Herb. 1: 289. (1894) | Britton: Trans. New York Acad. Sci. 12: 3. (1892) |
Web links |
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