Does anyone know if a book or list exists in which one can look up
whether a species of plant makes nectar or not?  I am part of a study
of butterfly habitat at the Indiana Dunes, and we are trying to survey
nectar sources.  However, I think some of plants we are listing do
no really make nectar.  e.g., I suspect that roses and Tradescantia
don't make nectar, but goldenrods and Cynthia do.  It would be helpful
to be able to check this in a book somewhere, since most of the plants
aren't in bloom.  Any ideas?
 
Liz Day
 
University of Illinois at Chicago
[log in to unmask]