Ranunculus pusillus

Poiret

in J. Lamarck et al., Encycl. 6: 99. 1804.

EndemicIllustrated
Synonyms: Ranunculus oblongifolius Elliott Ranunculus pusillus var. angustifolius (Engelmann ex Engelmann & A. Gray) L. D. Benson Ranunculus tener
Treatment appears in FNA Volume 3.

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

V3 337-distribution-map.gif

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.

Lower Taxa

None.
... more about "Ranunculus pusillus"
Alan T. Whittemore +
Poiret +
Ranunculus subg. Flammula +
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. +  and W.Va. +
0-300 m +
Ditches, ponds, and swamps +
Flowering spring (Apr–Jun). +
in J. Lamarck et al., Encycl. +
Endemic +  and Illustrated +
Ranunculus oblongifolius +, Ranunculus pusillus var. angustifolius +  and Ranunculus tener +
Ranunculus pusillus +
Ranunculus sect. Flammula +
species +