DISCOVERY OF CHAMAENERION LATIFOLIUM (L.) HOLUB (ONAGRACEAE) IN THE GREAT LAKES REGION

摘要

The first report of Chamaenerion latifolium (L.) Holub in the Great Lakes region is described from Kama Hills, near Nipigon, Ontario. This showy, long-lived herbaceous perennial is a circum-polar arctic and alpine plant of well-irrigated, open calcareous floodplains, river bars, seepage slopes, and scree slopes in alpine zones. Its presence in the region is remarkable, being disjunct from the next nearest populations over 700 km to the north. It adds to the list of disjunct arctic-alpine plants restricted to isolated pockets of disturbance-maintained, open rocky sites that have remained relatively unchanged since the retreat of the Wisconsinan glacier roughly 11,000 years ago.