Ranunculus macounii

Britton

Trans. New York Acad. Sci. 12: 3. 1892.

Common names: Renoncule de Macoun
Endemic
Synonyms: Ranunculus macounii var. oreganus (A. Gray) K. C. Davis
Treatment appears in FNA Volume 3.

Stems prostrate to nearly erect, often rooting nodally, hirsute or glabrous, base not bulbous. Roots never tuberous. Basal leaf blades cordate to reniform in outline, 3-foliolate, 3.7-7.5 × 4.5-9.5 cm, leaflets 3-lobed or -parted, ultimate segments elliptic or lance-elliptic, margins toothed or lobulate, apex acute to broadly acute. Flowers: receptacle hirsute; sepals spreading or reflexed ca. 1 mm above base, 4-6 × 1.5-3 mm, glabrous or hirsute; petals 5, yellow, 4-6 × 3.5-5 mm. Heads of achenes globose or ovoid, 7-11 × 7-10 mm; achenes 2.4-3 × 2-2.4 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lanceolate to broadly lanceolate, straight or nearly so, 1-1.2 mm. 2n = 32, 48.


Phenology: Flowering spring–summer (May–Sep).
Habitat: Meadows, depressions in woodlands, ditches, edges of streams and ponds, on wet soil or emergent from shallow water
Elevation: 0-2900 m

Distribution

V3 165-distribution-map.gif

Alta., B.C., Man., Nfld. and Labr. (Nfld.), N.W.T., Ont., Que., Sask., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Mich., Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Through most of its range, Ranunculus macounii has conspicuously hispid herbage. Glabrous plants are found, however, in the lower Columbia River valley (southwestern Washington and adjacent Oregon). This variant has been called R. macounii var. oreganus.

Selected References

None.

Lower Taxa

None.
... more about "Ranunculus macounii"
Alan T. Whittemore +
Britton +
Renoncule de Macoun +
Alta. +, B.C. +, Man. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Ariz. +, Calif. +, Colo. +, Idaho +, Mich. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
0-2900 m +
Meadows, depressions in woodlands, ditches, edges of streams and ponds, on wet soil or emergent from shallow water +
Flowering spring–summer (May–Sep). +
Trans. New York Acad. Sci. +
Ranunculus macounii var. oreganus +
Ranunculus macounii +
Ranunculus sect. Ranunculus +
species +