The distribution and status of <i>Acorus</i> (Araceae) in Canada

Abstract

Evidence is presented documenting the occurrence in Canada of two Acorus species. One is a widespread fertile diploid with which the name A. americanus has been associated. The other is a sterile taxon of more limited distribution, no doubt representing the well-known sterile triploid A. calamus of Europe, which has been widely introduced into North America.