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Permission graciously provided by the New York State Museum is acknowledged for use of illustrations published in several of their bulletins (NYS Museum); RichardS .MitchellandE.O.Beal(1979), Magnoliaceaethrough Ceratophyllaceae of New York State; Richard S. Mitchell and J. Kenneth Dean (1978), Polygonaceae (Buckwheat Family) of New York State; Richard S. Mitchell and J. Kenneth Dean (1982), Ranunculaceae (Crowfoot Family) of NewYork State; Richard S. Mitchell and Charles J. Sheviak (1982), Rare Plants of New York State; Eugene C. Ogden (1981), Field Guide to Northeastern Ferns; and Charles J. Sheviak (1982), Biosystematic Study of the Spiranthes cernua Complex. x Acknowledgments lum), George W. Argus (Salicaceae), Christopher S. Campbell (Poaceae), Paul M. Catling (Orchidaceae), Theodore S. Cochrane (Juncaceae, Cyperaceae, and other groups), C. D. K. Cook (Ranunculaceae, Sparganiaceae), William D. Countryman (Trapaceae), Robert K. Godfrey (Lentibulariaceae , Utricularia, preliminary checldist of taxa), Robert R. Haynes (families of the Alismatidae), Hugh H. lItis (Rubiaceae, Galium), Walter S. Judd (Ericaceae), Emmet J. Judziewcz (Poaceae), Robert Kral (Cyperaceae, especially Rhynchospora, Eriocaulaceae, Melastomataceae, Xyridaceae ), Roger Laushman (Juncaginaceae, Triglochin), Donald H. Les (Ceratophyllaceae), Richard S. Mitchell (Polygonaceae, preliminary checklist of taxa), C. Thomas Philbrick (Callitrichaceae, Podostemaceae), Anthony A. Reznicek (Cyperaceae, especially Carex), George B. Rossbach (Lentibulariaceae, Utricularia), A. Ernie Schuyler (Cyperaceae, especially Scirpus), Charles J. Sheviak (Orchidaceae ), S. Galen Smith (Cyperaceae, especially Scirpus , Typhaceae), Harold st. John (Hydrocharitaceae), Ronald L. Stuckey (Brassicaceae, preliminary checklist of taxa), Janice Coffey Swab (Juncaceae), W. Carl Taylor (Pteridophytes, especially Isoetes), Gordon C. Tucker (Cyperaceae , especially Cyperus, Eleocharis, Kyllinga, Lipocarpha , Elatinaceae), Edward G. Voss (preliminary checklist of taxa), John H. Wiersema (Nymphaeaceae), Jean w. Wooten (Alismataceae). Support for fieldwork is gratefully acknowledged: the University of Michigan Biological Station supported work for Hellquist during the summers of 1977, 1983, and 1985; the University ofOklahoma Biological Station supported work for Hellquist during the summer of 1981; the New Hampshire Agricultural Experiment Station supported research for Crow each year and the University of New Hampshire Central University Research Fund supported fieldwork in Newfoundland during the summer ofl982. Financial support for the botanical illustrations prepared by Pamela Bruns Brayton was provided by the New Hampshire Agricultural Experiment Station. We are also thankful for support services provided by the Massachusetts College of Liberal Arts while Hellquist coordinated the compilation of figures from various sources and prepared the draft copies of the plates. So too are we appreciative of the computing services at the University of New Hampshire. We are especially grateful to Dr. Gordon C. Tucker for officiating the coin toss which determined the order ofappearance of the authors' names on the title page. Preparation ofthis manual was an equally shared endeavor, the coauthors working over and revising every aspect of the manuscript together. To our families-Charlyn, Megan, and Jason Crow, Lindsay Crow Ackerman, and Marion, Eric, and Paul Hellquist-we owe a special debt of gratitude for their love, patience, and endurance during the preparation of this work. During the early stages of this project they cheerfully participated in two extended botanical expeditions , camping in Newfoundland and enduring the elements of the predictably unpredictable weather of a land we have all come to love. Eric prove~ to be an exceedingly able field assistant with a keen eye for plants, and has the distinction of finding the first plants of the elusive Curlygrass Fern, Schizaea pusilIa, in a raised bog in western Newfoundland. ...

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