Mapping will be based on a standard reference mark based on political units when available.
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Mesoamerica
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Mexico
:
Villaseñor Ríos, J. L. 2016. Checklist of the native vascular plants of Mexico/Catálogo de las plantas vasculares nativas de México. Revista Mex. Biodivers. 87(3): 559–902.
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North America
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United States
:
USDA, NRCS. 2007. The PLANTS Database (http://plants.usda.gov). National Plant Data Center, Baton Rouge.