Try contacting the biology (botany?) department at the University of California, Riverside (I don't have their number handy, try information for Riverside, CA). I believe they have nationally recognized programs in this area. Richard Chute [log in to unmask] Rancho Santa Ana Botanic Garden Claremont, CA 91711 Phone: (909) 625-8767, ext. 222 FAX: (909) 626-6760