assembles 509 species of ferns and fern allies and infraspecific taxa in 70 genera. The editors have revised nearly 80 of these taxa to reflect classification changes since publication of the last
standard work on ferns in North America. The gymnosperm treatments encompass 118 species in 22 genera. Identification keys, summaries of habitats and geographic ranges, pertinent synonymies, descriptions, chromosome numbers, and all other significant details are provided. More than 600 distribution maps and 65 illustration plates appear throughout.
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