Checklist » Asteraceae » Petasites frigidus var. frigidus
Last updated 11/26/2008 by David Giblin.
Petasites frigidus (L.) Fr. var. frigidus[FNA20, HC2]
alpine butterbur, arctic butterbur, sweet coltsfoot

Publication: Summa Veg. Scand. 182.

Origin: Native

selected vouchers: WTU

Notes: Cherniawsky and Bayer (1998a,b,c) have shown that plants called var. nivalis are part of the natural variability of var. frigidus.

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.
Synonyms & Misapplied Names:
Petasites frigidus (L.) Fr. var. nivalis (Greene) Cronquist[HC]