Genus «Croton»

[Gordon Thomás Hart]

I am searching for the addresses of specialists on the Euphorbiaceae
genus Croton.  This genus has evidently never been included in any 
monographs or other useful summary of the characteristics useful in 
distinguishing species, and I need to distinguish several species 
from the chaco of South America.  Please, if you know of somebody 
who can help me attempt identifications, please either pass on this 
message or my address to such a person.
	My postal address is:  G.T.Hart, Casilla 83, Tarija BOLIVIA