Ranunculus aquatilis |
Ranunculus oresterus |
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renoncule aquatique, water buttercup, water crowfoot, white water butter cup, white water crowfoot, white water crowsfoot, white western buttercup |
Blue Mountain buttercup |
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Roots | not thickened basally, canescent. |
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Stems | glabrous. |
erect or ascending, not rooting nodally, glabrous. |
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Leaves | laminate and filiform-dissected; laminate leaf blades reniform, 3-parted, 0.4-1.1 × 0.7-2.3 cm, segments obovate or fan-shaped, shallowly cleft, margins crenate; filiform-dissected leaves with stipules gradually tapering upward, connate for their whole length. |
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Proximal cauline leaf blades | narrowly elliptic to linear, 2.5-4.8 × 0.2-0.9 cm, base narrowly acuminate, margins entire, apex acute to acuminate. |
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Inflorescences | bracts lanceolate to linear. |
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Flowers | receptacle hispid, rarely glabrous; sepals spreading or reflexed, 2-4 × 1-2 mm, glabrous; petals 5, 4-7 × 1-5 mm; style 0.1-0.8 mm. |
receptacle glabrous; sepals 5, spreading or reflexed from base, 3-5 × 1-2 mm, glabrous; petals 5, 4-6 × 1-2 mm; nectary scales glabrous. |
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Fruiting pedicels | usually recurved. |
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Heads of achenes | hemispheric to ovoid, 2-4 × 2-5 mm; achenes 1-2 × 0.8-1.4 mm, glabrous or hispid; beak persistent, filiform, 0.1-1.2 mm. |
hemispheric, 2-4 × 3-5 mm; achenes 1-1.4 × 0.8 mm, glabrous; beak subulate, straight, 0.2-0.4 mm. |
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Ranunculus aquatilis |
Ranunculus oresterus |
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Phenology | Flowering spring (May). | |||||
Habitat | In moist meadows | |||||
Elevation | 1200-1700 m (3900-5600 ft) | |||||
Distribution |
AK; AL; AR; AZ; CA; CO; CT; DE; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Eurasia
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ID; OR |
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Discussion | Varieties 2 (2 in the flora). Ranunculus aquatilis is very variable. In the past it has often been treated as three or four species and many varieties. These segregate taxa have been based on the size, petiolation and rigidity of the leaves (now known to be primarily under environmental control), petal size and curvature of the fruiting pedicel (both sometimes variable along single stem), and number of achenes per head and length of achene beak (which vary continuously and are not correlated with one another). Unless reliable characters can be found, only two of the taxa recognized in older floras can be maintained. (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. Batrachium | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Batrachium aquatile | |||||
Name authority | Linnaeus: Sp. Pl. 1: 556. (1753) | L. D. Benson: Amer. J. Bot. 26: 555. (1939) | ||||
Web links |
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