Mine are all in full sun. Some are just done blooming while others (I may have cut back earlier in the year) are in bloom now.
I find it confusing when the first link says, "The dense, low, toothed foliage...", since mine is not close to the ground and isn't "dense".
If ellacombianus is the height of mine then that may be the one.
I've had the kamtschaticum for many years and that is a ground hugger.
Thank you for your help!