Petasites frigidus |
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alpine butterbur, arctic butterbur, arctic sweet coltsfoot, coltsfoot, northern sweet-coltsfoot, sweet coltsfoot |
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Habit | Plants 10–60(–120) cm. | ||||||||||||
Rhizomes | much branched, creeping, often forming long-lived, spreading clones. |
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Basal leaves | blades mostly reniform, orbiculate-cordate, cordate, ovate, triangular, or sagittate, margins subentire to coarsely dentate to wavy, or shallowly to deeply pinnipalmately or palmately lobed, lobes obtuse to acute, often again lobed or toothed, abaxial faces densely white-tomentose to lanate, adaxial faces densely lanate or floccose, glabrescent, or glabrous. |
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Staminate heads | 2–53 (ray florets: 0 or 1–70, styliferous and sterile, corolla laminae 1.1–12 mm; disc florets 11–78, functionally staminate; style branches 0–2.3 mm, papillate or hairy). |
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Pistillate heads | 5–60 (ray florets 30–139, pistillate and fertile, corolla laminae 0.6–6.3 mm; disc florets 1–12, functionally staminate, style branches 0–2.3 mm, papillate or hairy). |
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Phyllaries | staminate 3.6–12.8 × 1–4.4 mm, pistillate 1–9.5 × 0.7–3.3 mm, margins entire or serrate. |
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Cypselae | 1.7–3.5 mm; pappi (longest, pistillate heads) 7–17.3 mm. |
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Petasites frigidus |
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Distribution |
AK; CA; CO; CT; ID; MA; ME; MI; MN; MT; ND; NH; NY; OR; RI; SD; VT; WA; WI; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; Eurasia
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Discussion | Varieties 4 (4 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 637. | ||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Petasites | ||||||||||||
Subordinate taxa | |||||||||||||
Synonyms | Tussilago frigida, Nardosmia frigida | ||||||||||||
Name authority | (Linnaeus) Fries: Summa Veg. Scand., 182. (1845) | ||||||||||||
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