黄金狸豆(コガネタヌキマメ) Crotalaria assamica

　蝶のような黄色い花、たぬきのしっぽのような鞘、多分、コガネタヌキマメだと思います。

　It seems Crotalaria assamica. The plant is called a "bean of golden raccoon dog" in Japanese. The name comes from the fact that the flower is yellow and the capsule resembles a raccoon dog tail.