Is there some central, North American, or state-by-state source where
one can quickly determine what species have been found to be C4 (or
definitely identified as C3)? None of the floras that I've looked at
seem to have that information, and a search of BIOSYS or somesuch would
require pairing each individual species name with "metabolic pathway"
or C3 or C4 or somesuch -- a very time-consuming exercise if there are
lots of species, and probably not conclusive anyway.
William E. Williams
Department of Biology
St. Mary's College of Maryland