Vigna radiata var. setulosa

This wild relative of the mung bean is a vigorous tropical perennial legume native to South and Southeast Asia, best grown outdoors in warm, humid climates with partial shade. It benefits from well-drained, moderately fertile soil and regular watering, though it dislikes waterlogged conditions. As a legume, it fixes atmospheric nitrogen and can improve soil health, making it a useful companion plant in tropical gardens.