Ranunculus rhomboideus |
Ranunculus lobbii |
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Labrador buttercup, prairie buttercup, prairie crowfoot |
Lobb's aquatic buttercup, Lobb's buttercup, Lobb's water-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. |
glabrous. |
Leaves | laminate and filiform-dissected; laminate leaf blades reniform in outline, deeply 3-parted, 0.5-0.8 × 0.9-1.5 cm, segments elliptic or obovate, margins sometimes notched; filiform-dissected leaves sometimes few and inconspicuous, stipules gradually tapering upward, connate for whole length, mostly petiolate. |
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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. |
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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 spreading, 2-3 × 1-1.5 mm, glabrous; petals 5, 4-6 × 2-5 mm; style 1-1.5 mm. |
Fruiting pedicels | recurved. |
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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. |
hemispheric, 3 × 4-5 mm; achenes 2-2.4 × 1.4-1.8 mm, glabrous; beak deciduous, sometimes leaving stub to 0.2 mm. |
2n | = 16. |
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Ranunculus rhomboideus |
Ranunculus lobbii |
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Phenology | Flowering spring (Apr–Jun). | Flowering late winter–spring (Mar–May). |
Habitat | Prairies, or occasionally open woods or thickets | Shallow ponds and vernal pools |
Elevation | 0-900 m (0-3000 ft) | 0-300 m (0-1000 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
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CA; OR; BC
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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. Batrachium |
Sibling taxa | ||
Synonyms | R. hydrocharis | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | (Hiern) A. Gray: Proc. Amer. Acad. Arts 21: 364. (1886) |
Web links |
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