Ranunculus pusillus |
Ranunculus ficaria |
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low buttercup, low spearwort, weak buttercup |
ficaire, fig buttercup, lesser celandine, pilewort, renoncule ficaire |
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Roots | not thickened basally, glabrous. |
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Stems | erect or ascending, rooting at most proximal nodes, glabrous. |
erect to decumbent, not rooting nodally, glabrous, not bulbous-based, spheric or ellipsoid bulbils sometimes formed in leaf axils. |
Basal leaves | simple and undivided, blades cordate to deltate or semicircular, 1.8-3.7 × 2-4 cm, base cordate, margins entire or crenate, apex rounded or obtuse. |
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Proximal cauline leaf blades | ovate or lanceolate, 1.2-4.2 × 0.5-1.2 cm, base acute to truncate, margins entire or denticulate, apex acuminate to rounded. |
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Inflorescences | bracts linear to lanceolate or oblanceolate. |
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Flowers | receptacle glabrous; sepals 4-5, spreading or reflexed from base, 1.5-3 × 1-1.5 mm, glabrous or sparsely hirsute; petals 1-3, 1.5-2 × 0.5-1 mm; nectary scales glabrous. |
receptacle glabrous; sepals spreading, saccate at extreme base, 4-9 × 3-6 mm, glabrous; petals yellow, 10-15 × 3-7 mm. |
Heads of achenes | hemispheric to cylindric, 2-8 × 2-3 mm; achenes 1-1.2 × 0.6-0.8 mm, ± tuberculate, glabrous; beak absent or nearly so, to 0.1 mm. |
hemispheric, 4-5 × 6-8 mm; achenes 2.6-2.8 × 1.8-2 mm, pubescent; beak absent. |
Tuberous | roots present. |
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Ranunculus pusillus |
Ranunculus ficaria |
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Phenology | Flowering spring (Apr–Jun). | Flowering spring (Apr–May). |
Habitat | Ditches, ponds, and swamps | Shaded stream banks and moist disturbed areas |
Elevation | 0-300 m (0-1000 ft) | 0-300 m (0-1000 ft) |
Distribution |
AL; AR; CA; DC; DE; FL; GA; IL; IN; KY; LA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WV
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CT; DC; IL; KY; MA; MD; MI; MO; NJ; NY; OH; OR; PA; RI; TN; VA; WA; WV; BC; NF; ON; QC; native to Europe [Introduced in North America]
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Discussion | In most specimens of Ranunculus pusillus, the heads of achenes are hemispheric to short-ovate and only 2-3 mm. Occasional plants with cylindric heads of achenes 4-6 mm from the Gulf Coast states have been called R. pusillus var. angustifolius. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
In North America, Ranunculus ficaria seems to be expanding its range rapidly in areas with cool mesic climates. The species is extremely variable (especially in leaf size and stem posture), and many attempts have been made to divide it into varieties or subspecies (see P. D. Sell 1994). The different forms, however, intergrade extensively and the varieties are often impossible to distinguish. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula | Ranunculaceae > Ranunculus > subg. Ficaria |
Sibling taxa | ||
Synonyms | R. oblongifolius, R. pusillus var. angustifolius, R. tener | R. ficaria subsp. bulbifer, R. ficaria subsp. calthifolius, R. ficaria var. bulbifera |
Name authority | Poiret: in J. Lamarck et al., Encycl. 6: 99. (1804) | Linnaeus: Sp. Pl. 1: 550. (1753) |
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