Phaseolus supinus Macroptilium supinum is a species of flowering plant in the legume family known by the common name supine bean.

It is native to Mexico, with its distribution extending north into the US state of Arizona.

[1] This perennial herb has stems that creep across the ground, growing from a tuber.

Other flowers grow underground or under debris, do not open, and self-fertilize.

[1] This plant grows in grassland and oak woodland habitat.