1. 
2. 
[syn: silverweed, goose-tansy, goose grass, Potentilla anserina]
The Collaborative International Dictionary of English v.0.48:
Silverweed \Sil"ver*weed`\, n. (Bot.)
   A perennial rosaceous herb (Potentilla Anserina) having the
   leaves silvery white beneath.
   [1913 Webster]
WordNet (r) 3.0 (2006):
silverweed
    n 1: any of various twining shrubs of the genus Argyreia having
         silvery leaves and showy purple flowers
    2: low-growing perennial having leaves silvery beneath; northern
       United States; Europe; Asia [syn: silverweed, goose-
       tansy, goose grass, Potentilla anserina]