The study of specimens, including many types, from 24 major North American and European herbaria has led to the recognition and description of 31 species of Bouvardia, including the novelty B. standleyana.The three subgenera proposed by Schlechtendal re retained as the foundation of taxonomic order in the genus, although their retention is admittedly partially fostered by convenience.Keys to the subgenera and species are presented and synonymy, typification and information on distribution and habitat are given for each species in so far as possible.
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Will H. Blackwell (1968) studied this question.
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