Addenda to North American Carices

Abstract

During the routine determinations of many thousands of collections of Carex, ranging from Panama north to Alaska, since the pubilication of K. K. Mackenzie's treatment of the Cariceae (North American Flora Vol. 18, Parts 1-7, 1931-35), extensions in range for several hundred species have come to light. It seems advisable to put these on record, and for the purpose of further bringing Mackenzie's monograph up to date to include notice of changes in nomenclature and new taxa. New records in the present account represent states, provinces or countries for which no citations are given in Mackenzie's work and are based upon specimens identified by the writer. Relatively few records will be found here for the Pacific States since material from this area has been handled chiefly by the late J. W. Stacey and more recently by John Thomas Howell. Some of the records have already been published by the collectors either in miscellaneous notes scattered in periodicals or, in a few instances, in standard state floras, but it seemed best to include even the latter here for the sake of completeness. Changes in nomenclature, new names and new species, subspecies, varieties and forms are indicated (in parentheses when a change in the status of a previously known taxon or material of a newly described one has not been studied by the writer) but transfers and changes in category have been included only for those studied and concurred in by the writer. The material is arranged in the form of two lists, the first being in alphabetical order, where each name, in the case of new records or name-changes, is prefixed by the number employed by Mackenzie for the species. This number is followed by a letter in the case of a new subspecific categories or hybrids or by a fraction in the case of new species. The second list is arranged by states and countries as an aid to botanists working with local florist cs who may be interested in the reports.