At least I'm pretty sure this is “Autumn Joy.” I chose this one partly to illustrate what I have learned from my plant systematics expert: plant classifications are frequently in flux.
From Missouri Botanical Garden, http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=f560 » “A clump-forming perennial that features masses of tiny, star-like flowers which emerge pink, gradually change to deep rose-red and then coppery-rust in autumn as they die. Flowers appear in large, 3-6" across, flattened heads (cymes) atop stems of grayish-green, fleshy, rounded, succulent-like leaves growing in upright to slightly spreading clumps, typically to 2' tall. Commonly called stonecrop in reference to the frequent sighting of the genus in the wild growing on rocks or stony ledges. Attractive to butterflies throughout the growing season. Foliage and dead inflorescences persist well into the winter providing some additional interest.”
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...