Ranunculus glacialis |
Ranunculus testiculatus |
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glacier buttercup |
bur buttercup, hornseed buttercup, tubercled crowfoot |
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Stems | erect or ascending from caudices, not rooting nodally, distally glabrous or brown-pilose, not bulbous-based. |
erect or ascending, not rooting nodally, villous, not bulbous-based. |
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Basal leaf blades | reniform to broadly triangular in outline, 3-foliolate or deeply 3-parted, 1-4 × 1.6-4.4 cm, leaflets or segments 1-2x-parted, ultimate segments elliptic to oblanceolate or almost linear, margins entire or occasionally with 1-2 teeth, apex rounded to obtuse. |
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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Flowers | receptacle glabrous or brown-pilose; sepals spreading, 7-12 × 4-9 mm, brown-pilose; petals initially white, usually becoming red with age, 9-15 × 7-14(-18) mm. |
receptacle glabrous; sepals spreading, 3-6 × 1-2 mm, villous; petals yellow, 3-5 × 1-3 mm. |
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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. |
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Tuberous | roots absent. |
roots absent. |
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Fruiting | heads hemispheric, 5-8 × 7-16 mm; fruit wall smooth, not veined, loose but not inflated, winged along suture, fruits winged achenes; achenes 2.6-3 × 1.4-2 mm, glabrous; beak persistent, lanceolate, 0.8-2.3 mm. |
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Ranunculus glacialis |
Ranunculus testiculatus |
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Phenology | Flowering spring (Apr–May). | |||||
Habitat | Disturbed areas, especially in grassland | |||||
Elevation | 400-2500 m (1300-8200 ft) | |||||
Distribution |
AK; Eurasia |
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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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Beckwithia glacialis | Ceratocephalus orthoceras, Ceratocephalus testiculatus | ||||
Name authority | Linnaeus: Sp. Pl. 1: 553. (1753) | Crantz: Stirp. Austr. Fasc. 2: 97. (1763) | ||||
Web links |