Southwestern Plant Families Arranged Phylogenetically

For the most part, I am following the Angiosperm Phylogeny Group III for family-level and higher taxonomy. The Angiosperm Phylogeny Website also follows APGIII (so far as I can tell) and provides all kinds of supplementary information. See this page for a brief list of families that have changed recently or might otherwise be confusing. I've added infrafamilial taxa for some particularly large or heterogenous families.

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