That's good information. Thanks jumpman. In the shot with the problem, there are about four of these trees/bushes lined up along the LHS. I will check to see if/how much of the problem may be due to overlapping..but I think I can reproduce it with just the flowered bush in the foreground. (but I guess there would be significant overlapping even with just one bush with the way these models are designed). I'll check it out.

I haven't done anything to the models yet except add mipmaps to the skins.