Ranunculus rhomboideus |
Ranunculus sulphureus |
|
---|---|---|
Labrador buttercup, prairie buttercup, prairie crowfoot |
renoncule soufrée, sulphur buttercup |
|
Roots | slender, 0.8-1.8 mm thick. |
slender, 0.4-1 mm thick. |
Stems | erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. |
erect from short caudices, 3-20 cm, sparsely pilose to glabrous, each with 1-3 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 transversely elliptic to orbiculate, 1-3 × 1-3 cm, base obtuse to nearly truncate, margins crenate or else blades shallowly 3-lobed with crenate lateral lobes, apex rounded or rounded-apiculate. |
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 sparsely brown-pilose; receptacle brown-pilose; sepals 6-8 × 3-6 mm, abaxially densely brown-hispid; petals 5(-6), 8-12 × 6-10 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. |
ovoid-cylindric or ovoid, 6-7(-9) × 5-6 mm; achenes 1.8-2.2 × 1.4-1.8 mm, glabrous or sparsely brown-hispid; beak slender, straight or curved, 0.8-1.4 mm. |
2n | = 16. |
= 42, ca. 80, ca. 84, 96, ca. 98. |
Ranunculus rhomboideus |
Ranunculus sulphureus |
|
Phenology | Flowering spring (Apr–Jun). | Flowering late spring–summer (Jun–Sep). |
Habitat | Prairies, or occasionally open woods or thickets | Meadows and seepy slopes, often around late snowbeds, bogs, and streamsides |
Elevation | 0-900 m (0-3000 ft) | 0-1100 m (0-3600 ft) |
Distribution |
IA; IL; MI; MN; MT; ND; NE; SD; WI; AB; BC; MB; NT; ON; SK
|
AK; BC; NF; NT; QC; YT; Greenland; Eurasia |
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.) |
Material of Ranunculus sulphureus from the Aleutian Islands has 3-lobed leaves similar to those of R. nivalis. These plants are sometimes separated as R. sulphureus var. intercedens. (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. sulphureus var. intercedens | |
Name authority | Goldie: Edinburgh J. Sci. 6: 329. (1822) | Solander: in C. J. Phipps, Voy. North Pole, 202. (1774) |
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