Ranunculus pallasii |
Ranunculus hyperboreus |
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Pallas' buttercup, renoncule de Pallas |
arctic buttercup, far-northern buttercup, high northern buttercup, renoncule hyperboréale |
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Stems | creeping or floating, rooting nodally, glabrous, not bulbous-based. |
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. |
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Basal leaf blades | linear to obovate, undivided or 3-lobed, 1.5-3.6 × 0.3-2 cm, lobes lanceolate or elliptic, margins entire, apex rounded to acuminate. |
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Flowers | receptacle glabrous; sepals spreading, 6-10 × 4-7 mm, glabrous; petals 7-11, white or pink, 8-13 × 3-6 mm. |
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 hemispheric, 5-12 × 9-15 mm; achenes 4.2-5.2 × 2.4-3.2 mm, glabrous; beak persistent, lanceolate, straight or curved, 1-1.2 mm. |
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. |
Tuberous | roots absent. |
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2n | = 32. |
= 32. |
Ranunculus pallasii |
Ranunculus hyperboreus |
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Phenology | Flowering summer (Jul–Aug). | Flowering late spring–summer (Jun–Aug). |
Habitat | Shallow water of bogs and pools in muskeg and tundra | 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 | 0-700 m (0-2300 ft) | 0-3400 m (0-11200 ft) |
Distribution |
AK; MB; NF; NT; ON; QC; YT; Eurasia |
AK; CO; ID; MT; NV; UT; WY; AB; BC; MB; NF; NT; ON; QC; SK; YT; Greenland; Eurasia
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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. (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. Pallasiantha | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Hecatonia |
Sibling taxa | ||
Synonyms | R. hyperboreus subsp. arnellii, R. hyperboreus subsp. intertextus, R. hyperboreus var. samojedorum, R. hyperboreus var. tricrenatus, R. hyperboreus var. turquetilianus, R. natans var. intertextus | |
Name authority | Schlechtendal: Animadv. Bot. Ranunc. Cand. 1: 15. (1819) | Rottbøll: Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 458. (1770) |
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