Ranunculus alismifolius |
Ranunculus pygmaeus |
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common water plantain buttercup, kidney-leaf buttercup, plantain-leaf buttercup, water-plantain buttercup |
dwarf buttercup, pygmy buttercup |
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Roots | slender or fusiform-thickened basally, glabrous. |
slender, 0.1-0.6 mm thick. |
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Stems | erect or ascending, not rooting nodally, glabrous or hirsute. |
erect or ascending from short caudices, 0.6-3.5 cm (sometimes longer in fruit), each with 1-2 flowers. |
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Leaves | basal leaf blades with base acute; proximal cauline leaf blades lanceolate, ovate, or elliptic, 1.8-14.1 × 0.7-2.9 cm, base acuminate to rounded, margins entire or serrulate, apex obtuse to acuminate. |
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Basal leaves | persistent, blades reniform to transversely elliptic or semicircular, 3-parted or -divided, 0.45-0.9 × 0.6-1.3 cm, at least lateral segments again lobed, base truncate or nearly cordate, margins entire, apex rounded to obtuse. |
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Inflorescences | bracts lanceolate. |
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Flowers | receptacle glabrous; sepals 5, spreading or reflexed from base, 2-6 × 1-4 mm, glabrous or hirsute; petals 5-12, 5-14 × 2-8 mm; nectary scales glabrous. |
pedicels glabrous or pubescent; receptacle glabrous; sepals 2-4 × 1.2-1.6 mm, abaxially sparsely hairy, hairs colorless; petals 5, 1.2-3.5 × 1.1-2.8 mm; nectary scale glabrous. |
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Heads of achenes | hemispheric to globose, 3-7 × 4-8 mm; achenes 1.6-2.8 × 1.2-2 mm, glabrous or rarely hispid; beak lance-subulate, straight or weakly curved, 0.4-1.2 mm. |
nearly globose to cylindric, 2.5-7 × 2.5-5 mm; achenes 1-1.2 × 0.8-1.1 mm, glabrous; beak subulate, straight or curved, 0.3-0.7 mm. |
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2n | = 16. |
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Ranunculus alismifolius |
Ranunculus pygmaeus |
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Phenology | Flowering summer (Jul–Sep). | |||||||||||||||||||||
Habitat | Arctic and alpine meadows and slopes, usually around persistent snow patches | |||||||||||||||||||||
Elevation | 0-4000 m (0-13100 ft) | |||||||||||||||||||||
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; BC
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AK; CO; ID; MT; UT; WY; AB; BC; NF; NT; QC; YT; Greenland; Europe (Spitsbergen)
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Discussion | Varieties 6 (6 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Ranunculus pygmaeus var. langeana has been described as having deeply divided basal leaves and strongly elongate heads of achenes (at least 5 mm). These characteristics are not well correlated with one another, however, and the variety does not seem natural. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||||||||||||||||||
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | ||||||||||||||||||||
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Subordinate taxa | ||||||||||||||||||||||
Synonyms | R. pygmaeus var. langeana | |||||||||||||||||||||
Name authority | Geyer ex Bentham: Pl. Hartw., 295. (1849) | Wahlenberg: Fl. Lapp., 157. (1812) | ||||||||||||||||||||
Web links |
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