Petasites frigidus var. ×vitifolius

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

Distribution

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• Legacy Map

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

Discussion

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

Selected References

Bogle, A. L. 1968. Evidence for the hybrid origin of Petasites warrenii and P. vitifolius. Rhodora 70: 533–551.

Lower Taxa

None.