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This is a revised version of a comprehensive treatment of the vascular flora of Utah. All new taxa and distributional records discovered since the publication of the second edition in 2003 are included.
Keys are provided to families, genera, species, and infraspecific taxa (when present). Taxa are described, ecological data is given, and geographical information is provided. County distribution in Utah is given for each species and infra specific taxon. General geographical information is given for taxa that extend beyond the boundaries of Utah. Chromosome numbers are provided for each taxon, where that information was available in literature.
This contemporary fourth edition treats 2746 species, 425 infraspecific taxa, or a total of 3172 indigenous taxa; 853 species introduced; total taxa treated in this edition is 4025 in 156 vascular plant families, an increase of 95 taxa, plus three additional famihes.
The 2003 third edition included 2723 species and 415 infraspecific taxa, or a total of 3128 indigenous taxa in 153 vascular plant families. Introduced species treated were 792, a total flora treated to 3930 in 151 families, an increase of 293 taxa.
The 1993 second edition included 2602 species and 393 infraspecific taxa, or a total of 2995 indigenous taxa in the second edition. Total taxa treated in the second edition was 3677, up from 3507 in the first edition.
The 1987 first edition included 2572 species and 355 infraspecific taxa, for a total of 2927. Included were 582 introduced taxa for a total of 3509 taxa.
New nomenclatural combinations and proposals of new taxa are made for 14 groups, and one lectotype designation is made.