Abstract
Although the Mexican involucrate Trifoliums are related to the southern Rocky Mountain Trifolium Fendleri, there is a distinct hiatus between the Mexican plants and even the Trifoliums of Arizona and New Mexico, not a single species being common to the two areas. The writer has seen a considerable series of Arizona Trifoliums, but with the exception of a specimen from Huachuca Mountains, Cochise Co., which of course are near the Mexican boundary and are floristically strongly related to Mexico, these plants represent different species than the Mexican involucrate Trifoliums. The latter group, therefore, are treated as follows:
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