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. (Nfld.), N.W.T., 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.

"high" is not a number.

... more about "Ranunculus hyperboreus"
not prolonged +
compressed-ellipsoid +  and discoid +
1.2-3 times as wide as thick +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
with weak transverse wrinkles +  and smooth +
0.8mm;1.2mm +
rounded +
Alan T. Whittemore +
Rottbøll +
obtuse +  and cordate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
lobed;divided or deeply dissected +
large +  and small +
globose;cylindric +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
reniform;broadly flabellate deeply 3-lobed or 3-parted +
0.5 cm5 mm <br />0.005 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
Renoncule hyperboréale +
2-25-flowered +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
Greenland +, Alta. +, B.C. +, Man. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Mont. +, Nev. +, Utah +, Wyo. +  and Eurasia +
0-3400 m +
large +  and expanded +
showy +  and inconspicuous +
sessile +  and aggregate +
cylindric;obovoid;cylindric;obovoid;globose;lenticular;discoid +
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 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
short-ovoid;globose +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
axillary +  and terminal +
reniform +  and linear +
petiolate +, compound +  and simple +
whorled +, opposite +  and alternate +
cauline +  and basal +
parted +  and lobed +
palmate +  and pinnate +
toothed;crenate;toothed;crenate;entire +
distinct +
conspicuous +
linear +  and orbiculate +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering late spring–summer (Jun–Aug). +
4 +  and 250 +
Skr. Kiøbenhavnske Selsk. Laerd. Elsk. +
crescent--shaped +
nodal +  and basal +
not arillate +  and stalked +
lobed +  and undivided +
white;yellow;white;yellow;purple;sometimes;green +
deciduous +
distinct +
reflexed +  and spreading +
3 +  and 4 +
oblong +  and elliptic ovate or lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Illustrated +
(5-)10-many +
persistent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
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 +
crenulate +  and entire +
funnel--shaped +
perennial +  and annual +
hirsute +  and glabrous +
herbaceous +  and woody +