Ranunculus pusillus |
Ranunculus adoneus |
|
---|---|---|
low buttercup, low spearwort, weak buttercup |
alpine buttercup |
|
Roots | not thickened basally, glabrous. |
slender, 0.8-1.4 mm thick. |
Stems | erect or ascending, rooting at most proximal nodes, glabrous. |
erect from large caudices, 9-25 cm, glabrous, each with 1-3 flowers. |
Basal leaves | persistent, blades circular to reniform in outline, 2-3x-dissected into linear segments, 0.9-2.5 × 1.1-2.8 cm, base obtuse, margins entire, apices of segments narrowly rounded to acute. |
|
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. |
pedicels glabrous; receptacle glabrous; sepals 4-11 × 3-7 mm, abaxially sparsely pilose, hairs colorless; petals 5-10, 8-15 × 8-19 mm; nectary scale glabrous. |
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, 6-12 × 5-9 mm; achenes 1.8-2.4 × 1-1.4 mm, glabrous or nearly so; beak subulate, straight, 1.2-1.7 mm. |
2 | n = 16. |
|
Ranunculus pusillus |
Ranunculus adoneus |
|
Phenology | Flowering spring (Apr–Jun). | |
Habitat | Ditches, ponds, and swamps | Spring-summer (May–Sep). Alpine and subalpine meadows, usually around melting snowbanks |
Elevation | 0-300 m (0-1000 ft) | 2500-4000 m (8200-13100 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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CO; ID; MT; NV; UT; WY
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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.) |
Most collections of Ranunculus adoneus from Colorado, including the type specimen, tend to be small, with narrow leaf segments (only 0.5-1 mm wide) and large flowers. The more widespread form, with leaf segments 1-2 mm wide and more variable flowers, has been called R. adoneus var. alpinus. The leaf and flower characteristics are very poorly correlated, however, and specimens referable to var. alpinus vary greatly in stature and flower size, so the two forms scarcely merit formal recognition. (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. Epirotes |
Sibling taxa | ||
Synonyms | R. oblongifolius, R. pusillus var. angustifolius, R. tener | R. adoneus var. alpinus, R. eschscholtzii var. adoneus, R. eschscholtzii var. alpinus |
Name authority | Poiret: in J. Lamarck et al., Encycl. 6: 99. (1804) | A. Gray: Proc. Acad. Nat. Sci. Philadelphia 15: 56. (1863) |
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