Petasites frigidus var. ×vitifolius

(Greene) Cherniawsky

Canad. J. Bot. 76: 2072. 1999.

Common names: Pétasite à feuilles de vigne
Basionym: Petasites vitifolius Greene Leafl. Bot. Observ. Crit. 1: 180. 1906
Synonyms: Petasites nivalis subsp. vitifolius (Greene) J. Toman Petasites trigonophyllus Greene Petasites warrenii H. St. John
Treatment appears in FNA Volume 20. Treatment on page 639. Mentioned on page 638, 640.

Basal leaves: blades palmately to palmati-pinnately nerved, deltate or broadly cordate to reniform, 2–43 × 3.5–47 cm (bases sometimes convex-curved), irregularly palmately to palmati-pinnately lobed (primary lobes 4–14, triangular, sinuses usually less than halfway to bases, lobes subentire to sinuate-dentate, secondary lobes 0–11, entire or dentate, teeth to 44 per side), abaxial and adaxial faces glabrous or woolly to tomentose, sometimes glabrescent. Staminate heads 3–32; ray florets 2–27, corolla laminae 2.1–7.8 mm; disc floret style branches 0.4–1.4 mm, papillate or hairy. Pistillate heads 9–34; ray florets 48–89, corolla laminae 0.8–2.5 mm; disc florets: corolla lobes 0.8–2 mm, style branches 0.3–1.2 mm, papillate or hairy. Pappi (pistillate) to 15 mm. 2n = 60.

Phenology: Flowering early spring.
Habitat: Wet marshy sites, moist woodlands
Elevation: 100–1700 m



Alta., B.C., Man., Nfld. and Labr. (Labr.), N.W.T., Ont., Que., Sask., Yukon, Mich., Minn., Wash., Wis.


Petasites frigidus var. ×vitifolius often grows in association with one or both putative parents (P. frigidus var. palmatus and P. frigidus var. sagittatus).

Lower Taxa

Randall J. Bayer +, A. Linn Bogle +  and Donna M. Cherniawsky +
(Greene) Cherniawsky +
Petasites vitifolius +
Pétasite à feuilles de vigne +
Alta. +, B.C. +, Man. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Mich. +, Minn. +, Wash. +  and Wis. +
100–1700 m +
Wet marshy sites, moist woodlands +
Flowering early spring. +
Canad. J. Bot. +
bogle1968a +
Illustrated +
Petasites nivalis subsp. vitifolius +, Petasites trigonophyllus +  and Petasites warrenii +
Petasites frigidus var. ×vitifolius +
Petasites frigidus +
variety +