NOTEWORTHY COLLECTION

摘要

Significance of the Report. The third Michigan collection record of this highly invasive non-native species. Previous Knowledge. Petasites hybridus is native to Europe and central Asia, where it grows along riverbanks and other damp places. In northern Europe, as well as in areas where it has been introduced near the edge of its range, female individuals of P. hybridus are absent or rare. It is likely this plant spreads through its complex rhizomatous growth (Dingwall 1976). For centuries, Petasites hybridus has been used as a medical plant for migraines and as a remedy for hay fever due to its rich suite of sesquiterpene phy-tochemicals (Saritas et al. 2002; Lipton et al. 2004). Within its native range, there is a diverse geographical distribution of these sesquiterpenes as well as of a suite of alkaloids that varies between populations. As a result of this phyto-chemical variation, some populations are more frequently used as a source of medicinals that others (Chizzola et al. 2002). In addition to their medicinal uses, these phytochemicals play an important role in defense from herbivory (Hägele et al. 1998).