Ranunculus pusillus |
Ranunculus sardous |
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low buttercup, low spearwort, weak buttercup |
hairy buttercup, hairy crowfoot |
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Roots | not thickened basally, glabrous. |
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Stems | erect or ascending, rooting at most proximal nodes, glabrous. |
nearly erect, hispid, base not bulbous. |
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. |
pedicellate; receptacle pilose; sepals 5, reflexed, 3-8 × 1.5-3 mm, pilose; petals 5, 7-10 × 4-8 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. |
globose or ovoid, 5-8 × 6-7 mm; achenes 15-35 per head, 2-3 × 2-3 mm, faces sparsely papillate or sometimes smooth, glabrous, margin smooth; beak oblong to deltate, curved, 0.4-0.7 mm. |
Basal | and lower cauline leaf blades ovate to cordate, 3-foliolate, 2-6 × 2-6 cm, leaflets again parted, leaflet base truncate to acute, margins crenate-dentate to crenate-lobulate, apex rounded to obtuse. |
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Ranunculus pusillus |
Ranunculus sardous |
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Phenology | Flowering spring (Apr–Jun). | Flowering late winter–summer (Mar–Aug). |
Habitat | Ditches, ponds, and swamps | Roadsides, fields, open woods |
Elevation | 0-300 m (0-1000 ft) | 0-200 m (0-700 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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AL; AR; CA; FL; GA; IL; KS; KY; LA; MD; MO; MS; NC; NJ; NY; OK; OR; PA; RI; SC; TN; TX; VA; BC; native to Europe; Pacific Islands; Australia [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.) |
Ranunculus sardous was collected in New Brunswick and Ontario in the 1800s, but it apparently has not persisted in those provinces. (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. Echinella |
Sibling taxa | ||
Synonyms | R. oblongifolius, R. pusillus var. angustifolius, R. tener | R. parvulus |
Name authority | Poiret: in J. Lamarck et al., Encycl. 6: 99. (1804) | Crantz: Stirp. Austr. Fasc. 2: 84. (1763) |
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