The San Francisco Volcanic Field lies near the southern edge of the Colorado Plateau in north-central Arizona, and is dominated by an extensive Pinyon-Juniper woodland. During 2004 and 2005, a floristic inventory vouchered 487 taxa from 74 families and 268 genera, including eight species endemic to Arizona. The Asteraceae, Poaceae, Fabaceae, Brassicaceae, and Scrophulariaceae comprised 51% of the total flora. Eriogonum, Muhlenbergia, Penstemon, Aristida, Astragalus, and Cryptantha were the best represented genera. Nonnative taxa accounted for ten percent of the total flora. Cryptantha minima and Suckleya suckleyana were vouchered as new records for Arizona.
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Vol. 55 • No. 1