Ranunculus pusillus |
Ranunculus pacificus |
|
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low buttercup, low spearwort, weak buttercup |
Pacific buttercup |
|
Roots | not thickened basally, glabrous. |
never tuberous. |
Stems | erect or ascending, rooting at most proximal nodes, glabrous. |
erect or reclining, never rooting nodally, hispid or glabrous, base not bulbous. |
Basal leaf | blades broadly triangular to cordate in outline, 3-foliolate, 6-13 × 8-16 cm, leaflets lobed, margins toothed, ultimate segments elliptic to lance-elliptic or oblong, margins toothed, apex acute 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. |
|
Inflorescences | bracts linear to lanceolate or oblanceolate. |
|
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 hispid; sepals reflexed 1-2 mm above base, 6-9 × 3-4 mm, sparsely hispid; petals 5, abaxially yellow or purplish, adaxially yellow, 9-11 × 6-8 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. |
ovoid to globose, 9-11 × 8-11 mm; achenes 3.2-3.8 × 2-3 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lanceolate or subulate from triangular base, straight or tip weakly hooked, 1-1.8 mm. |
Ranunculus pusillus |
Ranunculus pacificus |
|
Phenology | Flowering spring (Apr–Jun). | Flowering summer (Jul). |
Habitat | Ditches, ponds, and swamps | Along streams and in meadows |
Elevation | 0-300 m (0-1000 ft) | 0 m (0 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
|
AK |
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.) |
Ranunculus pacificus is endemic to the Alaska panhandle. (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. Ranunculus > sect. Ranunculus |
Sibling taxa | ||
Synonyms | R. oblongifolius, R. pusillus var. angustifolius, R. tener | R. septentrionalis subsp. pacificus |
Name authority | Poiret: in J. Lamarck et al., Encycl. 6: 99. (1804) | (Hultén) L. D. Benson: Amer. Midl. Naturalist 40: 79. (1948) |
Web links |