Ranunculus rhomboideus |
Ranunculus glacialis |
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Labrador buttercup, prairie buttercup, prairie crowfoot |
glacier buttercup |
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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 from caudices, not rooting nodally, distally glabrous or brown-pilose, not bulbous-based. |
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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 reniform to broadly triangular in outline, 3-foliolate or deeply 3-parted, 1-4 × 1.6-4.4 cm, leaflets or segments 1-2x-parted, ultimate segments elliptic to oblanceolate or almost linear, margins entire or occasionally with 1-2 teeth, apex rounded to obtuse. |
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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 or brown-pilose; sepals spreading, 7-12 × 4-9 mm, brown-pilose; petals initially white, usually becoming red with age, 9-15 × 7-14(-18) mm. |
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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. |
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Tuberous | roots absent. |
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Fruiting | heads hemispheric, 5-8 × 7-16 mm; fruit wall smooth, not veined, loose but not inflated, winged along suture, fruits winged achenes; achenes 2.6-3 × 1.4-2 mm, glabrous; beak persistent, lanceolate, 0.8-2.3 mm. |
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2n | = 16. |
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Ranunculus rhomboideus |
Ranunculus glacialis |
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Phenology | Flowering spring (Apr–Jun). | |||||
Habitat | Prairies, or occasionally open woods or thickets | |||||
Elevation | 0-900 m (0-3000 ft) | |||||
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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AK; Eurasia |
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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.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Crymodes | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Beckwithia glacialis | |||||
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Linnaeus: Sp. Pl. 1: 553. (1753) | ||||
Web links |