Excerpt from The Flora of Boulder, Colorado, and Vicinity

As to nomenclature I have followed, except where plainly deficient in the light of later investigation, that of Rydberg's Flora of Colorado. While I feel that in the case of both genera and species there has been an over-multiplication - as for instance the splitting up of such a natural group as the pines into several genera, yet at the time of the preparation of this Flora the only convenient guide was Rydberg's work.

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