Checklist » Asteraceae » Petasites frigidus var. sagittatus
Last updated 11/26/2008 by David Giblin.
Petasites frigidus (L.) Fr. var. sagittatus (Pursh) Cherniawsky & R.J. Bayer[FNA20, HC2]
arrowhead sweet coltsfoot, arrowleaf coltsfoot

Publication: Canad. J. Bot. 76: 2070. 1999.

Origin: Native

selected vouchers: WTU

Notes: The taxonomy of this complex, including Petasites frigidus and P. sagittatus, is disputed. Cherniawsky and Bayer (1998a,b,c) have shown the group has diverged only recently, and proposed a series of varieties with broadly overlapping ranges. We prefer the classification of H&C and JPM, and maintain P. sagittatus as a full species.

References:

» 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.
» Cronquist, A. 1978. Compositae, Senecioneae. N. Am. Flora Ser. II. No. 10., pp. 174-179.
Synonyms & Misapplied Names:
Petasites sagittatus (Pursh) A. Gray[HC]