Abstract
This paper does not attempt to deal in a taxonomic way with the problem of species differentiation in the asters, but involves a study of the general distribution of certain species of that genus. In finding the distribution of each of the Indiana species of Aster throughout the United States, adjacent provinces of Canada and Mexico, the question arose as to the relation of the distribution in the state of Indiana to their general distribution in North America; that is, if the species is northern in Indiana, is the distribution northern in North America; if southern in Indiana, is it southern in general, etc.?
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