Spiraea tomentosa (Steeplebush)
A showy native bush that is often mistaken for a flower because is is only about 4' tall and its stems often die to the ground. Spirea likes full sun, wet to moist conditions. Standing water such as in a rain garden is fine if temporary.
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Photo By: Steven G. Johnson (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons