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
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