Ranunculus testiculatus |
Ranunculus populago |
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bur buttercup, hornseed buttercup, tubercled crowfoot |
Cusick's buttercup, mountain buttercup, popular buttercup |
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Roots | thickened basally, glabrous. |
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Stems | erect or ascending, not rooting nodally, villous, not bulbous-based. |
erect or ascending, never rooting nodally, glabrous. |
Leaves | basal leaf blades with base obtuse to cordate; proximal cauline leaf blades semicircular to cordate or ovate, 1.2-5.1 × 1.5-2.9 cm, base cordate to broadly obtuse, margins entire or crenulate, apex broadly acute to rounded. |
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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. |
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Inflorescences | bracts narrowly elliptic to ovate or lanceolate. |
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Flowers | receptacle glabrous; sepals spreading, 3-6 × 1-2 mm, villous; petals yellow, 3-5 × 1-3 mm. |
receptacle glabrous or hispidulous; sepals 4-5, spreading or reflexed from base, 3-5 × 2-4 mm, glabrous; petals 5-6, 4-9 × 2-5 mm; nectary scales glabrous. |
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, 3 × 4-5 mm; achenes 1.6-1.8 × 1.2 mm, glabrous; beak lance-subulate, straight, 0.2-1 mm. |
Tuberous | roots absent. |
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Ranunculus testiculatus |
Ranunculus populago |
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Phenology | Flowering spring (Apr–May). | Flowering spring–summer (Apr–Aug). |
Habitat | Disturbed areas, especially in grassland | Wet ground and shallow water, in wet meadows, bogs, streams, lakes |
Elevation | 400-2500 m (1300-8200 ft) | 1300-2000 m (4300-6600 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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CA; ID; MT; OR; WA
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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.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ceratocephala | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula |
Sibling taxa | ||
Synonyms | Ceratocephalus orthoceras, Ceratocephalus testiculatus | |
Name authority | Crantz: Stirp. Austr. Fasc. 2: 97. (1763) | Greene: Erythea 3: 19. (1895) |
Web links |