Definition of "willow-weed" [wil•low-weed]

• A European species of loosestrife (Lysimachia vulgaris). (noun)
• Any kind of Polygonum with willow-like foliage. (noun)

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• "All about grew tall, fruiting grasses, and many a bright flower; clusters of pink willow-weed, patches of yellow ragwort, the perfumed meadowsweet, and, amid bracken and bramble, the purple shining of a great campanula."