View photos of the edible plant, Phaseolus angustissimus (Slimleaf bean), profiled in the Wild Edible Series: Arizona and New Mexico: Vol 1.

A passage from Wild Edible Plants of New Mexico (Volume 1):

Another Wild bean in New Mexico is Phaseolus angustissimus (Slimleaf bean). It too grows in the Gila
region, to El Paso, and north to Santa Fe. Its leaves are narrower (and beans smaller) than Spotted bean; however, it is just as edible.