The author(s) declare that they have no competing interests.
The research in British Columbia was funded by the Social Sciences and Humanities Research Council of Canada (SSHRC) Grant # 820-2002-1008. Thanks to Dr. Evelyn Mathias for professional support, to the Herbarium at the University of Victoria, and to all of the research participants. Additional thanks are due to research participants Jan Bevan and Sheelagh MacKenzie-Salas for collecting botanical specimens. Former UVic students Joanne Breckenridge and Crystal Ross collected the other plant specimens.