The Collaborative International Dictionary of English v.0.48:
goose-tansy \goose-tansy\ n. (Bot.), Same as goose-grass. Syn: silverweed, goose-grass, Potentilla anserina. [WordNet 1.5]WordNet (r) 3.0 (2006):
goose-tansy n 1: low-growing perennial having leaves silvery beneath; northern United States; Europe; Asia [syn: silverweed, goose-tansy, goose grass, Potentilla anserina]