In quantity 2, over 50 members exhaustively describe and classify the ferns, fern allies, and gymnosperms of North the USA. overlaying over dozen fern and part a dozen gymnosperm households, they survey fern species of either ecological and horticultural value and assessment such gymnosperm taxa because the conifers--the dominant timber in lots of forests in addition to very important trees plants--and cycads, which exhibit major evolutionary beneficial properties. In all, the quantity assembles 509 species of ferns and fern allies and infraspecific taxa in 70 genera. The editors have revised approximately eighty of those taxa to mirror class adjustments in view that e-book of the final normal paintings on ferns in North the United States. The gymnosperm remedies surround 118 species in 22 genera. identity keys, summaries of habitats and geographic levels, pertinent synonymies, descriptions, chromosome numbers, and all different major information are supplied. greater than six hundred distribution maps and sixty five representation plates look throughout.
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