Ranunculus pusillus |
Ranunculus pallasii |
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low buttercup, low spearwort, weak buttercup |
Pallas' buttercup, renoncule de Pallas |
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Roots | not thickened basally, glabrous. |
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Stems | erect or ascending, rooting at most proximal nodes, glabrous. |
creeping or floating, rooting nodally, glabrous, not bulbous-based. |
Basal leaf | blades linear to obovate, undivided or 3-lobed, 1.5-3.6 × 0.3-2 cm, lobes lanceolate or elliptic, margins entire, apex rounded to acuminate. |
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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, 6-10 × 4-7 mm, glabrous; petals 7-11, white or pink, 8-13 × 3-6 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. |
globose or hemispheric, 5-12 × 9-15 mm; achenes 4.2-5.2 × 2.4-3.2 mm, glabrous; beak persistent, lanceolate, straight or curved, 1-1.2 mm. |
Tuberous | roots absent. |
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2n | = 32. |
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Ranunculus pusillus |
Ranunculus pallasii |
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Phenology | Flowering spring (Apr–Jun). | Flowering summer (Jul–Aug). |
Habitat | Ditches, ponds, and swamps | Shallow water of bogs and pools in muskeg and tundra |
Elevation | 0-300 m (0-1000 ft) | 0-700 m (0-2300 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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AK; MB; NF; NT; ON; QC; YT; Eurasia |
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.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula | Ranunculaceae > Ranunculus > subg. Pallasiantha |
Sibling taxa | ||
Synonyms | R. oblongifolius, R. pusillus var. angustifolius, R. tener | |
Name authority | Poiret: in J. Lamarck et al., Encycl. 6: 99. (1804) | Schlechtendal: Animadv. Bot. Ranunc. Cand. 1: 15. (1819) |
Web links |