1. Department of Biology, San Diego State University, San Diego, California 92182, U.S.A.;, Email: msimpson@mail.sdsu.edu
2. Rancho Santa Ana Botanic Garden and Claremont Graduate University, 1500 North College Avenue, Claremont, California 91711, U.S.A.
3. Department of Chemistry and Biochemistry, Eastern Oregon University, One University Boulevard, La Grande, Oregon 97850, U.S.A.