From Prairie Nursery:
Snowberry is a rounded and bushy shrub with small leaves on arching stems. Clusters of small bell-shaped flowers begin to bloom in early summer, followed by attractive snow white berries later in the season. The clustered fruits remain attractive on the naked stems, all winter long.This adaptable native shrub tolerates a variety of conditions and soil types, including clay, but the best flowering and fruiting will occur in full sun. Symphoricarpos albus spreads by suckering rhizomes to form a colony. Brushy shelter for summer birds and important berries in the middle of winter are important wildlife features. The fruit of Snowberry is an important winter food source for quail, pheasant, and grouse, but is considered inedible/toxic to humans.
 
Primary photo credit: born1945 on Flickr (CC BY 2.0 Deed)
Secondary photo credit: Llez on Wikimedia Commons (CC BY-SA 3.0 Deed)