1. Department of Organismal Biology Physiological Botany Uppsala University and The Linnean Center for Plant Biology Ullsv. 24E SE‐756 51 Uppsala Sweden
2. Department of Plant Biology and Forest Genetics Uppsala BioCenter Swedish University of Agricultural Sciences and The Linnean Center for Plant Biology PO Box 7080 SE‐75007 Uppsala Sweden
3. Laboratorio de Sistemática Molecular (Jardín Botánico) Instituto de Biología Universidad Nacional Autónoma de México Ciudad Universitaria Coyoacán México DF 04510 Mexico