Ranunculus allenii |
Ranunculus ambigens |
|
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Allen's buttercup, renoncule d'Allen |
water-plantain crowfoot, waterplantain spearwort |
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Roots | slender, 0.2-0.8 mm thick. |
not thickened basally, glabrous or somewhat canescent proximally. |
Stems | erect or ascending, 5-19 cm, sparsely pilose, each with 1-4 flowers. |
erect or ascending, rooting at proximal nodes, glabrous or sparsely hirsute. |
Basal leaves | persistent, blades reniform or semicircular, undivided or some 3-parted, 1.4-2.1 × 1.7-2.8 cm, base cordate or truncate, margins crenate with more than 5 crenae, apex rounded. |
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Proximal cauline leaf blades | lanceolate, 5.9-12.2 × 1.1-2.4 cm, base rounded-obtuse to acuminate, margins denticulate, apex acuminate. |
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Inflorescences | bracts linear or lanceolate. |
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Flowers | pedicels pilose, sometimes sparsely so; receptacle hispid; sepals 4-6 × 2-3 mm, abaxially pilose, hairs colorless; petals 5, 4-5 × 2-4 mm; nectary scale glabrous. |
receptacle glabrous; sepals 5, spreading or sometimes reflexed from base, 3-5 × 2-3 mm, glabrous; petals 5, 5-8 × 2-3 mm; nectary scales glabrous. |
Heads of achenes | ovoid to cylindric, 4-7 × 4-6 mm; achenes 1.6-1.8 × 1.2-1.4 mm, glabrous; beak lance-subulate, curved, 0.4-0.6 mm. |
short-ovoid to depressed-globose, 5-7 × 4-8 mm; achenes 1.8 × 1.2-1.4 mm, glabrous; beak lanceolate, straight, 0.6-1.2 mm. |
2n | = 32. |
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Ranunculus allenii |
Ranunculus ambigens |
|
Phenology | Flowering summer (Jul–Aug). | Flowering late spring–summer (May–Aug). |
Habitat | Wet alpine meadows, often around late snowbeds, shores of lakes and streams | Creeks, ponds, ditches, marshes |
Elevation | 700-1300 m (2300-4300 ft) | 0-700 m (0-2300 ft) |
Distribution |
NF; NT; QC |
AL; CT; DC; DE; GA; IL; IN; KY; LA; MA; MD; ME; MI; NC; NH; NJ; NY; OH; PA; RI; TN; VA; WV
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Discussion | The name Ranunculus obtusiusculus Rafinesque has been mistakenly used for R. ambigens. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | ||
Sibling taxa | ||
Name authority | B. L. Robinson: Rhodora 7: 220. (1905) | S. Watson: Bibl. Index N. Amer. Bot. 1: 16. (1878) |
Web links |