The genus Frasera was described in 1788 by Walter (Fl. Carol. 87-88, 1788) with a single species, F. caroliniensis. Numerous species from western North America were added by later authors and the genus was generally accepted, as it was by Asa Gray and by Bentham & Hooker, and by many others. Recently H. H. Card published a revision of the genus Frasera (Mo. Bot. Gard., Ann. 18:245-282, figs. 1-4, pi. 14-15, 1931), dissatisfaction with which induced the author to prepare these notes.
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Harold St. John (1941) studied this question.