Phaseolus polystachios, also known as the thicket bean or wild kidney bean, is a perennial, herbaceous vine that is native to North America. It is unique among the Phaseolus in that its native range extends across the eastern temperate United States to southeast Canada, while most Phaseolus are tropical or subtropical. It is the namesake for the Polystachios group clade, which is the most species-rich within Phaseolus (17 species). In spite of its common name, it is more closely related to the lima bean (Phaseolus lunatus), and it holds potential as a crop wild relative due to its resistance to white mold (Sclerotinia sclerotiorum).