Ranunculus rhomboideus |
Ranunculus pygmaeus |
|
---|---|---|
Labrador buttercup, prairie buttercup, prairie crowfoot |
dwarf buttercup, pygmy buttercup |
|
Roots | slender, 0.8-1.8 mm thick. |
slender, 0.1-0.6 mm thick. |
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
erect or ascending from short caudices, 0.6-3.5 cm (sometimes longer in fruit), each with 1-2 flowers. |
Basal leaves | persistent, blades ovate to rhombic, undivided or rarely innermost 3-parted, 1.1-5.3 × 0.9-3.6 cm, base obtuse, margins crenate with 5 crenae, apex rounded. |
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. |
Flowers | pedicels pilose; receptacle pilose; sepals 4-6 × 1.5-3 mm, abaxially pilose, hairs colorless; petals 5, 6-8 × 2-4 mm; nectary scale 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. |
Heads of achenes | depressed-globose, 4-6 × 5-7 mm; achenes 1.8-2.2 × 1.2-1.8 mm, glabrous; beak slender, curved, 0.2-0.3 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. |
2n | = 16. |
= 16. |
Ranunculus rhomboideus |
Ranunculus pygmaeus |
|
Phenology | Flowering spring (Apr–Jun). | Flowering summer (Jul–Sep). |
Habitat | Prairies, or occasionally open woods or thickets | Arctic and alpine meadows and slopes, usually around persistent snow patches |
Elevation | 0-900 m (0-3000 ft) | 0-4000 m (0-13100 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
|
AK; CO; ID; MT; UT; WY; AB; BC; NF; NT; QC; YT; Greenland; Europe (Spitsbergen)
|
Discussion | In addition to the range given above, L. D. Benson (1948) cited nineteenth-century specimens from Quebec, New York, Massachusetts, and Rhode Island. No modern specimens have been seen from those areas. (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.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes |
Sibling taxa | ||
Synonyms | R. pygmaeus var. langeana | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Wahlenberg: Fl. Lapp., 157. (1812) |
Web links |