Ranunculus adoneus |
Ranunculus ranunculinus |
|
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alpine buttercup |
tadpole buttercup |
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Roots | slender, 0.8-1.4 mm thick. |
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Stems | erect from large caudices, 9-25 cm, glabrous, each with 1-3 flowers. |
erect from short caudices, not rooting nodally, glabrous, not bulbous-based. |
Leaves | basal leaf blades ovate to semicircular in outline, ternately or pinnately 2x-compound, 2.4-8.2 × 2-8.5 cm, leaflets parted and again lobed, ultimate segments elliptic to linear, margins entire (or occasionally a lobe reduced to tooth), apex acuminate to rounded. |
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Basal leaves | persistent, blades circular to reniform in outline, 2-3x-dissected into linear segments, 0.9-2.5 × 1.1-2.8 cm, base obtuse, margins entire, apices of segments narrowly rounded to acute. |
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Flowers | pedicels glabrous; receptacle glabrous; sepals 4-11 × 3-7 mm, abaxially sparsely pilose, hairs colorless; petals 5-10, 8-15 × 8-19 mm; nectary scale glabrous. |
receptacle glabrous; sepals spreading or reflexed from base, 3-6 × 1-3 mm, glabrous; petals (0-)5-6, yellow, 3-8 × 1-3 mm. |
Heads of achenes | ovoid, 6-12 × 5-9 mm; achenes 1.8-2.4 × 1-1.4 mm, glabrous or nearly so; beak subulate, straight, 1.2-1.7 mm. |
hemispheric to globose, 4-5 × 6-7 mm; achenes 2.2-3.6 × 1.2-1.8 mm, glabrous; beak filiform, strongly reflexed from base, 0.8-1.5 mm, brittle, often broken. |
2 | n = 16. |
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Tuberous | roots absent. |
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2n | = 32. |
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Ranunculus adoneus |
Ranunculus ranunculinus |
|
Phenology | Flowering spring–summer (Apr–Aug). | |
Habitat | Spring-summer (May–Sep). Alpine and subalpine meadows, usually around melting snowbanks | Open grassy or brushy slopes |
Elevation | 2500-4000 m (8200-13100 ft) | 1700-2600 m (5600-8500 ft) |
Distribution |
CO; ID; MT; NV; UT; WY
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CO; NM; UT; WY
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Discussion | Most collections of Ranunculus adoneus from Colorado, including the type specimen, tend to be small, with narrow leaf segments (only 0.5-1 mm wide) and large flowers. The more widespread form, with leaf segments 1-2 mm wide and more variable flowers, has been called R. adoneus var. alpinus. The leaf and flower characteristics are very poorly correlated, however, and specimens referable to var. alpinus vary greatly in stature and flower size, so the two forms scarcely merit formal recognition. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Cyrtorhyncha > sect. Cyrtorhyncha |
Sibling taxa | ||
Synonyms | R. adoneus var. alpinus, R. eschscholtzii var. adoneus, R. eschscholtzii var. alpinus | Cyrtorhyncha ranunculina |
Name authority | A. Gray: Proc. Acad. Nat. Sci. Philadelphia 15: 56. (1863) | (Nuttall) Rydberg: Bot. Surv. Nebraska 3: 23. (1894) |
Web links |