Taxonomic notes: Phaseolus parvifolius Freytag is a secondary wild relative of tepary bean, P. acutifolius A. Gray var. acutifolius, and a tertiary wild relative of common bean, P. vulgaris L. var. vulgaris and year bean, P. dumosus Macfad. (USDA, ARS, National Genetic Resources Program 2015).

Phaseolus parvifolius is native to northern and southern Mexico and to Jalapa and Zacapa in Guatemala (USDA, ARS, National Genetic Resources Program 2015).

Freytag and Debouck (2002 p. 34) describe this species as "rare".

This small vine grows in dry grassland parks and along stream beds in open oak–pine forests with Agave, Acacia and Calliandra where it favours rocky soils derived from schist, basalt, grantite or limestone (Freytag and Debouck 2002).

It is a wild relative of, and potential gene donor to tepary (secondary gene pool), common and year bean (tertiary gene pool) (USDA, ARS, National Genetic Resources Program 2015).

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• Freytag, G.F. and Debouck, D.G. 2002. Taxonomy, Distribution, and Ecology of the Genus Phaseolus (Leguminosae–Papilionoideae) in North America, Mexico and Central America. Botanical Research Institute of Texas, Fort Worth.
• USDA, ARS, National Genetic Resources Program. 2015. Germplasm Resources Information Network - (GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. Available at: http://www.ars-grin.gov/.