Ranunculus glaberrimus |
Ranunculus hydrocharoides |
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sagebrush buttercup, smooth buttercup |
frog's-bit buttercup, frogbit buttercup |
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Roots | cylindric, 1-3 mm thick. |
not thickened basally, glabrous. |
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Stems | prostrate or ascending, 4-15 cm, glabrous, each with 1-4 flowers. |
erect to prostrate, usually rooting nodally, glabrous or strigose. |
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Basal leaves | persistent, blades reniform or obovate to very narrowly elliptic, 0.7-5.2 × 1-2 cm, base truncate, obtuse or attenuate, margins entire or with 3 broad, apical crenae, apex rounded to acute. |
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Proximal cauline leaf blades | ovate to broadly ovate, 0.8-2.7 × 0.8-1.9 cm, base rounded to weakly cordate, margins entire or dentate, apex rounded or obtuse. |
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Inflorescences | bracts lanceolate to oblanceolate or sometimes ovate. |
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Flowers | pedicels glabrous or nearly so; receptacle glabrous; sepals 5-8 × 3-7 mm, abaxially glabrous or sparsely pilose, hairs colorless; petals 5-10, 8-13 × 5-12 mm; nectary scale glabrous or ciliate. |
receptacle glabrous; sepals 5, spreading or reflexed from base, 1.5-3 × 1-2 mm, glabrous; petals 5-6, 3-5 × 1-2 mm; nectary scales glabrous. |
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Heads of achenes | globose, 7-12(-20) × 6-11(-20) mm; achenes 1.4-2.2 × 1.1-1.8 mm, usually finely pubescent; beak subulate or lance-subulate, straight or curved, 0.4-1 mm. |
hemispheric or globose, 2-4 × 3-4 mm; achenes 1.2-1.4 × 1-1.2 mm, glabrous; beak lanceolate to lance-filiform, straight or curved, 0.4-1 mm. |
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Ranunculus glaberrimus |
Ranunculus hydrocharoides |
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Phenology | Flowering late spring–summer (Jun–Aug). | |||||
Habitat | Wet soil or shallow water, in marshes and edges of streams and lakes | |||||
Elevation | 2000-2900 m (6600-9500 ft) | |||||
Distribution |
AZ; CA; CO; ID; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; SK
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AZ; CA; NM; Mexico; Central America (in Guatemala)
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Discussion | Varieties 2 (2 in the flora). Usually only a minority of the ovaries develop, and the fruiting receptacle is completely hidden by aborted ovaries. Populations growing at high elevations (Ranunculus glaberrimus var. ellipticus) and low elevations (var. glaberrimus) are usually well differentiated, but these varieties intergrade at intermediate elevations. The Thompson Indians rubbed the flowers or the whole plant of Ranunculus glaberrimus on arrow points as a poison (D. E. Moerman 1986). (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. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | R. hydrocharoides var. stolonifer | |||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 12. (1829) | A. Gray: Mem. Amer. Acad. Arts, ser. 2, 5: 306. (1855) | ||||
Web links |
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