I didn't sow it, but I'm 99% sure it is Kobe Lespedeza. It doesn't get tall, comparable to common white clover I would say. If the cool seasons get gnawed down in time it'll be thick as carpet. Critters seem to love it.
Grows well with Dallas grass here.
Korean Lespedeza Seed - (Kummerowia striata) - Korean lespedeza is a heavy seed producing great for hay, pasture, game birds, food plots and erosion control. Korean Lespedeza is earlier to mature than Kobe making Korean a better species for the Northern climates. Korean Lespedeza is very popular...
hancockseed.com