Species in the genus Rhynchosia:

Rhynchosia volubilis / Tankirimame タンキリマメ

Rhynchosia volubilis is a climbing perennial found in sunny locations, like grassland and forest edges, the stems having downward hairs, going up counterclockwise to the other plants around. Leaves are composed of 3 leaflets, each 3-5cm long, 2.5-4cm wide, and relatively thick, and on the backsides, there exist lots of downward hairs and brown-yellow granular dots. Flowers, light yellow, about 9mm in diameter, come in a racemose way. Legumes ripen red to split open; insides expose two black seeds. Bloom time: July-September.