Never hear of it, LUCKY YOU! I believe it is also called Chinese Clover.
This is a very invasive plant which I understand was imported from China back in the 1800's in one of the Carolinas. It is now found in almost every county in Missouri and unfortunately on my farm in SE Iowa.
Does anyone have a good idea of how to control it or even better, eliminate it? Burning seems to make it spread faster. Chemicals only control one years crop so gets very expensive. In process of mowing it with a sickle bar mower as close to the ground as I can get. Tough stuff! Makes me wish I had a HURD transmission.