Ranunculus adoneus |
Ranunculus marginatus |
|
---|---|---|
alpine buttercup |
margined buttercup |
|
Roots | slender, 0.8-1.4 mm thick. |
|
Stems | erect from large caudices, 9-25 cm, glabrous, each with 1-3 flowers. |
erect, sparsely pilose. |
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. |
blades reniform to semicircular, undivided or shallowly 3-lobed, 2.5-5 × 3-7 cm, base truncate to nearly cordate, margins crenate or dentate, apex rounded or obtuse. |
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. |
pedicellate; receptacle hispid; sepals 5, reflexed 1 mm from base, 3-5 × 1-2 mm, hispid; petals 5, 4-5 × 2-3.5 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 × 6 mm; achenes 15-20 per head, 2.5-3 × 2-2.5 mm, faces covered with high sharp tubercles or low spines, glabrous, margin smooth; beak deltate, straight, 0.8-1 mm. |
2 | n = 16. |
|
Ranunculus adoneus |
Ranunculus marginatus |
|
Phenology | Flowering spring (Mar–May). | |
Habitat | Spring-summer (May–Sep). Alpine and subalpine meadows, usually around melting snowbanks | Roadsides |
Elevation | 2500-4000 m (8200-13100 ft) | 0-100 m (0-300 ft) |
Distribution |
CO; ID; MT; NV; UT; WY
|
AL; LA; TX; native to Europe [Introduced in North America] |
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.) |
A form of Ranunculus marginatus, with the fruits weakly tuberculate or almost smooth, similar to the smooth-fruited forms of R. sardous, is found in Europe; it is not known from North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella |
Sibling taxa | ||
Synonyms | R. adoneus var. alpinus, R. eschscholtzii var. adoneus, R. eschscholtzii var. alpinus | |
Name authority | A. Gray: Proc. Acad. Nat. Sci. Philadelphia 15: 56. (1863) | d'Urville: Mém. Soc. Linn. Paris 1: 318. (1822) |
Web links |