dyer's broom

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n.1.small Eurasian shrub (Genista tinctoria) having clusters of yellow flowers that yield a dye; common as weed in England and U.S.; sometimes grown as an ornamental.
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It was a viridian Spring: Hemlocks rose as though cypress, dyer's broom bloomed among the acacia, and no frost lapped at the grass-green grass, until rain changed the series, pouring gray into the ground, into the dove gray fields for the months ahead: Numbers 1, 2, 3 and 4, each a grizzled square of pearls on paper, when out-of-doors, wear the bark of ash trunks 200 years old.