Thanks, but this much I already have. Rondo isn't even an exact location, as it's mainly just a turn in the road that isn't ID'd on Google Earth.
I can find the Rondo Cemetery on GE just because I know about it, but "about two miles" is the same as "16 city blocks, give or take", and "southeast" could be east-southeast or south-southeast. That still covers a wide swath, it's known to be on private property, and it's too small to be seen on GE.
However, I have been given a couple of leads to follow offline, so I may yet find it. I initially had some confusion because there is a "Kelley" Cemetery AND a "Kelly" cemetery in Polk Co., and are both named for the same family.