Ranunculus rhomboideus |
Ranunculus triternatus |
|
---|---|---|
Labrador buttercup, prairie buttercup, prairie crowfoot |
Dalles Mountain buttercup, obscure buttercup |
|
Roots | slender, 0.8-1.8 mm thick. |
cylindric, 2-3 mm thick. |
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
prostrate or ascending, 5-20 cm, glabrous, each with 1-6 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 rhombic to deltate or reniform in outline, 3-4x-dissected, 1.1-3.4 × 2-3.1 cm, segments linear, base obtuse, margins crenate, apices of segments narrowly rounded. |
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; receptacle short-pubescent; sepals 4-8 × 2-5 mm, abaxially glabrous or nearly so; petals 5, 6-15 × 4-10 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. |
depressed-globose, 4-6 × 5-8 mm; achenes 1.8-2.2 × 1.2-1.8 mm, finely pubescent; beak subulate, straight, 0.8-1.5 mm. |
2n | = 16. |
|
Ranunculus rhomboideus |
Ranunculus triternatus |
|
Phenology | Flowering spring (Apr–Jun). | Flowering spring (Apr–May). |
Habitat | Prairies, or occasionally open woods or thickets | Grassland or sagebrush |
Elevation | 0-900 m (0-3000 ft) | 900-1700 m (3000-5600 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
|
ID; NV; OR; WA
|
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.) |
Of conservation concern. C. L. Hitchcock et al. (1955-1969, vol. 2) considered the name Ranunculus triternatus A. Gray to be an illegitemate homonym and used the illegitimate (superfluous) name R. reconditus A. Nelson & J. F. Macbride for this species. The name Ranunculus triternatus Poiret was not validly published (not accepted by Poiret) and does not invalidate R. triternatus A. Gray. (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. glaberrimus var. reconditus | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | A. Gray: Proc. Amer. Acad. Arts 21: 370. (1886) |
Web links |