solanum elaeagnifolium

(noun) weedy nightshade with silvery foliage and violet or blue or white flowers; roundish berry widely used to curdle milk; central United States to South America. Synonyms: trompillo, white horse nettle, prairie berry, purple nightshade, silverleaf nightshade, silver-leaved nightshade, silver-leaved nettle, Solanum elaeagnifolium.