Ranunculus rhomboideus |
Ranunculus macounii |
|
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Labrador buttercup, prairie buttercup, prairie crowfoot |
Macoun's buttercup, renoncule de Macoun |
|
Roots | slender, 0.8-1.8 mm thick. |
never tuberous. |
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
prostrate to nearly erect, often rooting nodally, hirsute or glabrous, base not bulbous. |
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 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 | 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 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 | 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. |
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. |
2n | = 16. |
= 32, 48. |
Ranunculus rhomboideus |
Ranunculus macounii |
|
Phenology | Flowering spring (Apr–Jun). | Flowering spring–summer (May–Sep). |
Habitat | Prairies, or occasionally open woods or thickets | Meadows, depressions in woodlands, ditches, edges of streams and ponds, on wet soil or emergent from shallow water |
Elevation | 0-900 m (0-3000 ft) | 0-2900 m (0-9500 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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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 | 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.) |
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.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus |
Sibling taxa | ||
Synonyms | R. macounii var. oreganus | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Britton: Trans. New York Acad. Sci. 12: 3. (1892) |
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