Firstly, the original question is too open ended (there are 30-35,000 species to write about). Some compendiums mention 1-2,000 different plants, but the information on each is very brief.
Secondly, what information are you looking for? Some books deal more with taxonomy & relationships, but barely touch on cultural requirements.
Lastly, have you considered 'Orchids for Dummies'? I never opened it, but I know the editor and trust his judgment.
For more relevant information, you need a book on at most one genus, or perhaps only a sub-section. However, so many people rely on the internet for information, that there there are few new books coming out. The Vanda book by Martin Motes is a good one for that genus.
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Kim (Fair Orchids)
Founder of SPCOP (Society to Prevention of Cruelty to Orchid People), with the goal of barring the taxonomists from tinkering with established genera!
I am neither a 'lumper' nor a 'splitter', but I refuse to re-write millions of labels.
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