Ranunculus rhomboideus |
Ranunculus laxicaulis |
|
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Labrador buttercup, prairie buttercup, prairie crowfoot |
Mississippi buttercup |
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Roots | slender, 0.8-1.8 mm thick. |
not thickened basally, glabrous. |
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
erect or ascending, often rooting at proximal nodes, glabrous or sparsely pilose. |
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. |
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Proximal cauline leaf blades | ovate to lanceolate or narrowly elliptic, 1.5-5.7 × 0.4-2.4 cm, base cordate to acute, margins finely denticulate or entire, apex broadly rounded to acuminate. |
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Inflorescences | bracts linear to lanceolate or oblanceolate. |
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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 glabrous; sepals 4-5, spreading or reflexed from base, 2-3 × 1.5-3 mm, glabrous or pubescent; petals 4-6, 2-6 × 1-2 mm; nectary scales glabrous. |
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, 2-4 × 2-3 mm; achenes 0.8-1 × 0.8 mm, glabrous; beak deciduous, leaving stump 0.1-0.2 mm. |
2n | = 16. |
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Ranunculus rhomboideus |
Ranunculus laxicaulis |
|
Phenology | Flowering spring (Apr–Jun). | Flowering late winter–summer (Mar–Jul). |
Habitat | Prairies, or occasionally open woods or thickets | Around ponds and ditches, in meadows, roadsides, and open woods |
Elevation | 0-900 m (0-3000 ft) | 0-100 m (0-300 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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AL; AR; DE; GA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NJ; OK; SC; TN; TX; VA
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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.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula |
Sibling taxa | ||
Synonyms | R. mississippiensis, R. subcordatus, R. texensis | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Darby: Man. Bot. 2: 4. (1841) |
Web links |