Ranunculus rhomboideus |
Ranunculus platensis |
|
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Labrador buttercup, prairie buttercup, prairie crowfoot |
prairie buttercup |
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Roots | slender, 0.8-1.8 mm thick. |
|
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
decumbent, 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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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. |
sessile; receptacle glabrous or pilose; sepals 3, spreading, 1-2 × 0.5-1 mm, hirsute; petals 3, 1-2 × 0.5-0.8 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. |
hemispheric, 2-2.5 × 3-3.5 mm; achenes 10-15 per head, 1.3-1.7 × 1-1.3 mm, faces and proximal margin finely papillate, each papilla crowned with hooked bristle, otherwise glabrous; beak semicircular to deltate, curved, 0.2-0.5 mm. |
Basal | and lower cauline leaf blades reniform, 3-parted, 0.8-1.7 × 1.2-2 cm, segment base cordate, margins dentate or lobulate, apex rounded-obtuse. |
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2n | = 16. |
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Ranunculus rhomboideus |
Ranunculus platensis |
|
Phenology | Flowering spring (Apr–Jun). | Flowering winter–spring (Feb–Apr). |
Habitat | Prairies, or occasionally open woods or thickets | Weed in disturbed areas, usually near coast |
Elevation | 0-900 m (0-3000 ft) | 0-200 m (0-700 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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AL; FL; GA; LA; MS; NC; TX; native to South America (s Brazil, Uruguay, and Argentina) [Introduced in North America]
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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.) |
|
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella |
Sibling taxa | ||
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | A. Sprengel: in K. Sprengel, Syst. Veg. 5: 586. (1828) |
Web links |