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This is the third revision of the Checklist of Vascular Plants of Maine. Like its predecessors, it lists all ferns and related plants, conifers, and flowering plants native and naturalized in Maine and records their county-level distribution in the state. The first Check- list (Ogden et al. 1948) was based on specimens in herbaria at the University of Maine (hereafter referred to as MAINE), Portland Society of Natural History, New England Botanical Club, Gray Herbarium of Harvard University, and the private collection of Glen D. Chamberlain of Presque Isle, Maine (now part of MAINE). Bean et al. (1966) revised the checklist to include additions to the flora and update the nomenclature to follow Fernald (1950). Richards et al. (1983) added many new state and county records in the second revision.
The purpose of this revision is twofold. First, we have included many new county and state records. Since Richards et al. (1983) there has been considerable collecting in Maine, much of it directed at searching for new state and county records in relatively neglected regions of the state. Second, there have been numerous changes in the scientific names of Maine plants since Fernald (1950), the nomenclatural basis of Richards et al. (1983). We have largely followed Kartesz's (1994) nomenclature (see "Taxonomy and Nomenclature" section). Recent work on rare plants and establishment of an official list of endangered and threatened plants in Maine (Dibble et al. 1989; Maine State Planning Office 1990) also motivate updating the known distribution and taxonomy of Maine's flora.
Maine Agricultural and Forest Experiment Station
Campbell, Christopher S.; Adams, Heman P.; Adams, Patricia; Dibble, Alison C.; Eastman, Leslie M.; Gawler, Susan C.; Gregory, Linda L.; Grunden, Barbara A.; Haines, Arthur D.; Jonson, Ken; Rooney, Sally C.; Vining, Thomas F.; Weber, Jill E.; and Wright, Wesley A.. 1995. B844: Checklist of the Vascular Plants of Maine Third Revision. Maine Agricultural and Forest Experiment Station Bulletins 844.