Ranunculus hyperboreus

Rottbøll

Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 458. 1770.

Common names: Renoncule hyperboréale
Illustrated
Synonyms: Ranunculus hyperboreus subsp. arnellii Scheutz Ranunculus hyperboreus subsp. intertextus (Greene) B. M. Kapoor & A. Löve Ranunculus hyperboreus var. samojedorum (Ruprecht) Perfiljev Ranunculus hyperboreus var. tricrenatus Ruprecht Ranunculus hyperboreus var. turquetilianus Polunin Ranunculus natans var. intertextus (Greene) L. D. Benson
Treatment appears in FNA Volume 3.

Stems prostrate, glabrous, rooting nodally. Leaves: basal leaves absent, cauline leaf blades reniform to broadly flabellate, deeply 3-lobed or 3-parted, 0.3-1.2 × 0.5-2.1 cm, base obtuse to cordate, lobes undivided or lateral lobes cleft, terminal segment entire or distally crenulate, apex rounded. Flowers: receptacle glabrous; sepals 3-4, spreading or reflexed from base, 2-4 × 1-3 mm, glabrous; petals 3-4, 2-4 × 1-3 mm; nectary on petal surface, scale poorly developed and forming crescent-shaped ridge surrounding but not covering nectary; style 0.1-0.2 mm. Heads of achenes globose or short-ovoid, 3-5 × 2-5 mm; achenes 1-1.4 × 0.8-1.2 mm, glabrous; beak linear, curved, 0.1-0.4 mm. 2n = 32.


Phenology: Flowering late spring–summer (Jun–Aug).
Habitat: Floating in shallow water or stranded on exposed mud at margins of streams and ponds and open wet soil and marshes, in tundra or boreal or subalpine forest
Elevation: 0-3400 m

Distribution

V3 537-distribution-map.gif

Greenland, Alta., B.C., Man., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Colo., Idaho, Mont., Nev., Utah, Wyo., Eurasia.

Discussion

Specimens of Ranunculus hyperboreus from the central and southern Rocky Mountains have the leaves always cordate and the fruiting heads always 4-5 mm; they have been separated as R. hyperboreus subsp. intertextus. Although Arctic specimens are more variable, they often have shallowly cordate leaf bases and equally large heads of achenes, so segregation of the subspecies seems inappropriate.

Selected References

None.

Lower Taxa

None.
... more about "Ranunculus hyperboreus"
Alan T. Whittemore +
Rottbøll +
Renoncule hyperboréale +
Greenland +, Alta. +, B.C. +, Man. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Mont. +, Nev. +, Utah +, Wyo. +  and Eurasia. +
0-3400 m +
Floating in shallow water or stranded on exposed mud at margins of streams and ponds and open wet soil and marshes, in tundra or boreal or subalpine forest +
Flowering late spring–summer (Jun–Aug). +
Skr. Kiøbenhavnske Selsk. Laerd. Elsk. +
Illustrated +
Ranunculus hyperboreus subsp. arnellii +, Ranunculus hyperboreus subsp. intertextus +, Ranunculus hyperboreus var. samojedorum +, Ranunculus hyperboreus var. tricrenatus +, Ranunculus hyperboreus var. turquetilianus +  and Ranunculus natans var. intertextus +
Ranunculus hyperboreus +
Ranunculus sect. Hecatonia +
species +