), the year bean or year-long bean,[1][2] is an annual to perennial herbaceous vine in the family Fabaceae (legumes), native to a narrow region in the highlands of Guatemala.

[1] It was recently found to be a hybrid between two other cultivated species of Central America, Phaseolus coccineus and P. vulgaris and displays intermediate characteristics.

[2] Taxonomically, it was previously categorized as Phaseolus polyanthus and P. coccineus ssp.

[4] This species grows in humid forests and may reach 10 meters in length.

[5] The plant prefers a cool and humid environment.