From
Gay Histories and Cultures b
y George E. Haggerty
From Gay New York (which has been on my to read list for years now. from skimming, I need to move it up to the top since he explores the prewar era in which gay and straight had not yet been turned into an absolute binary opposition as they are today. Better yet, he discusses differences between bourgeois and working class public sexual cultures that are illuminating.
This is something we've often brought up at LBO, to the shock and horror of folks here, but Chauncey gives concrete ethnographic and historical details to support Foucault's thesis. Just read his introduction for a basic synopsis of the argument and select illustrations) Once you get to the URL below, search on pansy. http://books.google.com/books?id=NNHGuVdPELYC&printsec=frontcover&dq=Gay+New+York
Not really sure about the reliability of this one, but Herbst's discussion of the use of flowers to represent gender is interesting, though it does not illuminate much about the use of pansy or heartsease in Elizabethan times: http://books.google.com/books?id=8rgUeEpWfbsC&pg=PA103&dq=Wimmin,+Wimps+%26+Wallflowers+pansy