Wil·low-herb n. Bot. A perennial herb (Epilobium spicatum) with narrow willowlike leaves and showy rose-purple flowers. The name is sometimes made to include other species of the same genus.
Spiked willow-herb, a perennial herb (Lythrum Salicaria) with willowy leaves and spiked purplish flowers.
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willowherb
n : a plant of the genus Epilobium having pink or yellow flowers
and seeds with silky hairs