Ranunculus rhomboideus |
Ranunculus macranthus |
|
---|---|---|
Labrador buttercup, prairie buttercup, prairie crowfoot |
large buttercup, showy buttercup, smallflower buttercup |
|
Roots | slender, 0.8-1.8 mm thick. |
tuberous. |
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
erect or decumbent, never rooting nodally, hispid, base not bulbous. |
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. |
blades ovate in outline, 3-5-foliolate, 3.8-10 × 2.7-9 cm, leaflets 1x-lobed, ultimate segments narrowly elliptic to oblanceolate, margins entire or with few teeth, apex broadly acute to rounded-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. |
receptacle hispid; sepals spreading or weakly reflexed ca. 1 mm above base, 7-10 × 3-5 mm, hispid; petals 10-22, yellow, 12-22 × 4-9 mm. |
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. |
globose to cylindric, 8-14 × 8-10 mm; achenes 2.2-4.2 × 2.8-3.4 mm, glabrous, margin forming narrow rib 0.4-0.6 mm wide; beak usually persistent, filiform from deltate base, straight, 2-4 mm. |
2n | = 16. |
= 32. |
Ranunculus rhomboideus |
Ranunculus macranthus |
|
Phenology | Flowering spring (Apr–Jun). | Flowering late winter–spring (Mar–May). |
Habitat | Prairies, or occasionally open woods or thickets | Riverbanks and wet meadows |
Elevation | 0-900 m (0-3000 ft) | 0-400 m (0-1300 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
|
TX
|
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.) |
|
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus |
Sibling taxa | ||
Synonyms | R. fascicularis var. cuneiformis | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Scheele: Linnaea 21: 585. (1848) |
Web links |