Ranunculus hispidus |
Ranunculus testiculatus |
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bristly buttercup, hispid crowfoot, renoncule hispide |
bur buttercup, hornseed buttercup, tubercled crowfoot |
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Roots | never tuberous. |
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Stems | erect or decumbent, sometimes rooting nodally, hispid or strigose, base not bulbous. |
erect or ascending, not rooting nodally, villous, not bulbous-based. |
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Basal leaf | blades ovate to deltate in outline, 3-foliolate or outer blades merely 3-parted, 2-13.4 × 2.4-16.8 cm, leaflets undivided to lobed or parted, ultimate segments narrowly elliptic or oblanceolate to circular, margins toothed, apex acuminate to rounded. |
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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Flowers | receptacle hispid; sepals spreading or reflexed, 4-10 × 2-5 mm, hispid; petals 5, yellow, 8-16 × 3-9 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 | hemispheric to short-ovoid, 6-10 × 7-10 mm; achenes 2.2-5.2 × 2-3.8 mm, glabrous, margin forming narrow rib or broad wing 0.1-1.2 mm wide; beak persistent, lance-subulate, straight or somewhat curved, 0.8-2.6 mm. |
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. |
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Ranunculus hispidus |
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 |
AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; MB; NB; NF; NS; ON; PE; QC
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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 3 Until recently, the varieties of Ranunculus hispidus were usually treated as distinct species. Arguments for restoring species status to R. hispidus var. nitidus were given by G. L. Nesom (1993). (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 | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | Ranunculaceae > Ranunculus > subg. Ceratocephala | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Ceratocephalus orthoceras, Ceratocephalus testiculatus | |||||||||
Name authority | Michaux: Fl. Bor.-Amer. 1: 321. (1803) | Crantz: Stirp. Austr. Fasc. 2: 97. (1763) | ||||||||
Web links |