37 The total number of PFA accepted taxa
The PLANTS database contains native and naturalized plants of the PLANTS Floristic Area (PFA), which consists of North America and all additional U.S. territories and protectorates. Vascular plant distributions are mapped at the state and province level, and by U.S. county. Our checklists for the non-vascular mosses, liverworts, hornworts, and lichens cover all of North America north of Mexico; no additional distribution data are currently available for these plants. Checklist and plant distribution by island and island group for the U.S. territories and protectorates in the PFA Pacific Basin area are in preparation but are not yet included at PLANTS. The total number of PFA accepted taxa at the rank of binomial and below is about 38,000. PLANTS also has about 5000 vascular plants that do not occur spontaneously (i.e., are not naturalized) in the PFA; these are selected if you choose Not in PLANTS Floristic Area. Most of these are of economic importance, and many of them are cultivated within the PFA.
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