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The Collaborative International Dictionary
Willow-weed

Willow-weed \Wil"low-weed`\, n. (Bot.)

  1. A European species of loosestrife ( Lysimachia vulgaris).

  2. Any kind of Polygonum with willowlike foliage.

Wiktionary
willow-weed

n. 1 A European species of loosestrife ((taxlink Lysimachia vulgaris species)). 2 Any kind of ''Polygonum'' with willow-like foliage.