Ranunculus testiculatus |
Ranunculus cooleyae |
|
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bur buttercup, hornseed buttercup, tubercled crowfoot |
Cooley's buttercup |
|
Stems | erect or ascending, not rooting nodally, villous, not bulbous-based. |
erect from short caudices, not rooting nodally, glabrous, not bulbous-based. |
Basal leaf | blades broadly spatulate in outline, 1-2x-dissected, 0.9-3.8 × 0.5-1.5 cm, segments linear, margins entire, apex obtuse to acuminate. |
blades circular to reniform in outline, 3-5-parted, 0.8-3.8 × 1.7-6.9 cm, segments again lobed, ultimate segments elliptic or oblong, margins crenate, apex rounded; cauline leaf 0-1, scalelike. |
Flowers | receptacle glabrous; sepals spreading, 3-6 × 1-2 mm, villous; petals yellow, 3-5 × 1-3 mm. |
receptacle glabrous; sepals spreading, yellow, 7-11 × 4-7 mm, glabrous; petals 11-15, yellow, 8-12 × 3-5 mm. |
Heads of achenes | cylindric, 9-16(-27) × 8-10 mm; achenes 1.6-2 × 1.8-2 mm, tomentose; beak persistent, lanceolate, 3.5-4.5 mm. |
hemispheric or spheric, 7-8 × 9-10 mm; achenes 2.4-4.6 × 1.2-2.2 mm, glabrous; beak persistent, filiform, hooked distally, 1-1.8 mm. |
Tuberous | roots absent. |
roots absent. |
2n | = 16. |
|
Ranunculus testiculatus |
Ranunculus cooleyae |
|
Phenology | Flowering spring (Apr–May). | Flowering late spring–summer (Jun–Aug). |
Habitat | Disturbed areas, especially in grassland | Slopes near persistent snowbanks |
Elevation | 400-2500 m (1300-8200 ft) | 500-1800 m (1600-5900 ft) |
Distribution |
AZ; CA; CO; IA; ID; KS; MN; MO; MT; ND; NE; NM; NV; OH; OR; SD; UT; WA; WY; BC; SK; native to Eurasia [Introduced in North America]
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AK; WA; BC
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Discussion | In North America, Ranunculus testiculatus seems to be expanding its range rapidly in arid and semiarid areas. A second species of this subgenus, R. falcatus Linnaeus [Ceratocephala falcata (Linnaeus) Persoon], has been reported from North America, but all reports seem to be based on misidentified material of R. testiculatus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ceratocephala | Ranunculaceae > Ranunculus > subg. Cyrtorhyncha > sect. Arcteranthis |
Sibling taxa | ||
Synonyms | Ceratocephalus orthoceras, Ceratocephalus testiculatus | Arcteranthis cooleyae, Kumlienia cooleyae |
Name authority | Crantz: Stirp. Austr. Fasc. 2: 97. (1763) | Vasey & Rose ex Rose: Contr. U.S. Natl. Herb. 1: 289. (1894) |
Web links |