a plant, Potentilla anserina, of the rose family, the leaves of which have a silvery pubescence on the underside.
any of several other plants having leaves with a silvery appearance.

1570–80; silver + weed1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
silverweed (ˈsɪlvəˌwiːd)
1.  a rosaceous perennial creeping plant, Potentilla anserina, with silvery pinnate leaves and yellow flowers
2.  any of various convolvulaceous shrubs of the genus Argyreia, of SE Asia and Australia, having silvery leaves and purple flowers

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Silverweed will spread by above ground runners similar to strawberries.
Pacific silverweed can be propagated easily from container or bare root stock, as it produces many stolons and rhizomes.
In addition, the riprap has provided good habitat for silverweed, which has expanded onto the riprap area.
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