[1] Univ Pisa, Dept Biol, Bot Garden & Bot Museum, I-56126 Pisa, Italy
[2] Univ Calabria, Museum Nat Hist, I-87030 Commenda Di Rende, Italy
[3] Univ Calabria, Bot Garden, I-87030 Commenda Di Rende, Italy
[4] Nat Hist Museum, Dept Bot, London SW7 5BD, England