an annual plant (Lespedeza striata) of the pea family, grown for hay and foliage in the SW U.S.
See Japan clover in American Heritage Dictionary 4
An annual plant (Lespedeza striata) native to China and Japan, having compound leaves with many leaflets and small pink axillary flowers. Cultivated as a forage plant and for soil improvement, it is widely naturalized in the southeast United States. Also called Japanese clover.