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