Ranunculus sardous |
Ranunculus hyperboreus |
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hairy buttercup, hairy crowfoot |
arctic buttercup, far-northern buttercup, high northern buttercup, renoncule hyperboréale |
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Stems | nearly erect, hispid, base not bulbous. |
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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Flowers | pedicellate; receptacle pilose; sepals 5, reflexed, 3-8 × 1.5-3 mm, pilose; petals 5, 7-10 × 4-8 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 ovoid, 5-8 × 6-7 mm; achenes 15-35 per head, 2-3 × 2-3 mm, faces sparsely papillate or sometimes smooth, glabrous, margin smooth; beak oblong to deltate, curved, 0.4-0.7 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. |
Basal | and lower cauline leaf blades ovate to cordate, 3-foliolate, 2-6 × 2-6 cm, leaflets again parted, leaflet base truncate to acute, margins crenate-dentate to crenate-lobulate, apex rounded to obtuse. |
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2n | = 32. |
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Ranunculus sardous |
Ranunculus hyperboreus |
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Phenology | Flowering late winter–summer (Mar–Aug). | Flowering late spring–summer (Jun–Aug). |
Habitat | Roadsides, fields, open woods | 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 | 0-200 m (0-700 ft) | 0-3400 m (0-11200 ft) |
Distribution |
AL; AR; CA; FL; GA; IL; KS; KY; LA; MD; MO; MS; NC; NJ; NY; OK; OR; PA; RI; SC; TN; TX; VA; BC; native to Europe; Pacific Islands; Australia [Introduced in North America]
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AK; CO; ID; MT; NV; UT; WY; AB; BC; MB; NF; NT; ON; QC; SK; YT; Greenland; Eurasia
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Discussion | Ranunculus sardous was collected in New Brunswick and Ontario in the 1800s, but it apparently has not persisted in those provinces. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Hecatonia |
Sibling taxa | ||
Synonyms | R. parvulus | 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 | Crantz: Stirp. Austr. Fasc. 2: 84. (1763) | Rottbøll: Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 458. (1770) |
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