1. Department of Agriculture (Botany), High Polytechnic School of Huesca, University of Zaragoza Ctra. Cuarte km 1, 22071 Huesca, Spain; E-mail: adiape@cantv.net (A.D.-P.); pcatalan@unizar.es (P.C.)
2. Department of Biology (CEM), Universidade da Madeira Alto da Penteada, 9000 Funchal, Portugal; E-mail: sequeira@uma.pt
3. Botanic Garden of La Orotava (ICIA) Retama 2, 38400 Puerto de la Cruz, Tenerife, Spain; E-mail: asantos@icia.es