Difference between revisions of "Ranunculus pusillus"
in J. Lamarck et al., Encycl. 6: 99. 1804.
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− | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>erect or ascending, rooting at most proximal nodes, glabrous. <b>Roots</b> not thickened basally, glabrous. <b>Proximal</b> 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. <b>Inflorescences</b>: bracts linear to lanceolate or oblanceolate. <b>Flowers</b>: 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. <b>Heads</b> 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.</span><!-- |
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|publication year=1804 | |publication year=1804 | ||
|special status=Endemic;Selected by author to be illustrated | |special status=Endemic;Selected by author to be illustrated | ||
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|genus=Ranunculus | |genus=Ranunculus | ||
|subgenus=Ranunculus subg. Ranunculus | |subgenus=Ranunculus subg. Ranunculus | ||
|section=Ranunculus sect. Flammula | |section=Ranunculus sect. Flammula | ||
|species=Ranunculus pusillus | |species=Ranunculus pusillus | ||
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-->[[Category:Treatment]][[Category:Ranunculus sect. Flammula]] | -->[[Category:Treatment]][[Category:Ranunculus sect. Flammula]] |
Revision as of 14:38, 27 July 2019
Stems erect or ascending, rooting at most proximal nodes, glabrous. Roots not thickened basally, glabrous. 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. 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.
Phenology: Flowering spring (Apr–Jun).
Habitat: Ditches, ponds, and swamps
Elevation: 0-300 m
Distribution
Ala., Ark., Calif., Del., D.C., Fla., Ga., Ill., Ind., Ky., La., Md., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va.
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.
Selected References
None.