Ranunculus rhomboideus |
Ranunculus arvensis |
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Labrador buttercup, prairie buttercup, prairie crowfoot |
corn buttercup, devil-on-all-sides, field buttercup, hungerweed |
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Roots | slender, 0.8-1.8 mm thick. |
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Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
erect or ascending, 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. |
pedicellate; receptacle sparsely hispid; sepals 5, spreading, 4-7 × 1-2 mm, strigose; petals 5, 5-8 × 2-4 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. |
discoid, 8-9 mm across; achenes 5-8 per head, 4-6.4 × 2.8-4.4 mm, faces and margin covered with long spines, glabrous; beak lance-subulate, straight, 1.6-3.8 mm. |
Basal | and lower cauline leaf blades obovate to rhombic in outline, 3-parted or 3(-5)-foliolate, 1.8-5.2 × 1.6-4.2 cm, leaflets oblanceolate or divided into oblanceolate or linear segments, leaflet base narrowly acuminate, margins entire or distally dentate, apex rounded or acuminate. |
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2n | = 16. |
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Ranunculus rhomboideus |
Ranunculus arvensis |
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Phenology | Flowering spring (Apr–Jun). | Flowering spring (Mar–Jun). |
Habitat | Prairies, or occasionally open woods or thickets | Grasslands, ephemeral pools, disturbed areas |
Elevation | 0-900 m (0-3000 ft) | 0-1200 m (0-3900 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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AR; CA; DC; GA; ID; IL; KS; LA; MO; MS; NC; NJ; NY; OR; PA; SC; TN; UT; WA; South America; native to Eurasia; Pacific Islands; Australia [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.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella |
Sibling taxa | ||
Synonyms | R. arvensis var. tuberculatus | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Linnaeus: Sp. Pl. 1: 555. (1753) |
Web links |
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