Origin: Native
Voucher:WTU (view specimen records)
Notes: FNA20: "Petasites frigidus var. ×vitifolius often grows in association with one or both putative parents (P. frigidus var. palmatus and P. frigidus var. sagittatus)."
Bogle (1961, 1968) produced this hybrid through artificial crosses.
Literature:
» Bogle, A. L. 1961. A study of the genus Petasites in the Pacific Northwest, with special reference to Petasites warrenii St. John. Unpublished M.S. thesis, University of Washington, Seattle.
» Bogle, A. L. 1968. Evidence for the hybrid origin of Petasites warrenii and P. vitifolius. Rhodora 70: 533-551.
» Gleason, H. A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada, 2nd ed. The New York Botanical Garden, Bronx. 910 p.
» Toman, J. 1972. A taxonomic survey of the genera Petasites and Endocellion. Folia Geobot. Phytotaxon. 7: 381-406.
» Cherniawsky, D. M. and R. J. Bayer. 1998a. Systematics of North American Petasites (Asteraceae: Senecioneae). I. Morphometric analysis. Canadian Journal of Botany 76: 23-36.
» Cherniawsky, D. M. and R. J. Bayer. 1998b. Systematics of North American Petasites (Asteraceae: Senecioneae). II. Isozyme analysis and population genetic structure. Canadian Journal of Botany 76: 1476-1487.
» Cherniawsky, D. M. and R. J. Bayer. 1998c. Systematics of North American Petasites (Asteraceae: Senecioneae). III. A taxonomic revision. Canadian Journal of Botany 76: 2061-2075.
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