Osage Orange, Maclura pomifera, does indeed burn well, but is not readily available in most areas. It is native to Oklahoma, southern Kansas, a bit in Arkansas & Texas, but the early settlers took cuttings back east, and it can be found in various places now, though not in huge amounts.

I LOVE it for woodturning, as it is durable and pretty stable..(doesn't distort much)

Here is why I hate to see it burned Osage bowl