These are busy times for the botanist who would keep informed in matters Of nomenclature. The committee had some appreciation of this fact when undertaking its task, but this appreciation has increased during the progress of the work. The aim has been, in accordance with the wish Of the Vermont Botanical Club, to follow a conservative policy in matters of nomenclature. In all cases, unless otherwise stated, the preferred name is that in accord with the usages of the Kew herbarium, which means in general the usage of the Gray Manual and the Synoptical Flora of North America. Where the name established by the rules Of the Botanical Club of the American Association for the Advancement of Science, as expressed in the britton-brown Illustrated Flora, is at variance with this preferred name, it follows in parenthesis. All such synonymous names are included in the index.