The Collaborative International Dictionary
Heuchera Americana
Alum root \Al"um root`\ (Bot.) A North American herb ( Heuchera Americana) of the Saxifrage family, whose root has astringent properties.
Wikipedia
Heuchera americana
Heuchera americana, or American alumroot, is a small (under 2 ft. high and wide) evergreen perennial native to eastern and central North America in the Saxifrage family.