black knapweed

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Related to black knapweed: greater knapweed
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  • noun

Synonyms for black knapweed

a weedy perennial with tough wiry stems and purple flowers

References in periodicals archive ?
They thrive around the late summer flowers of lucerne, black knapweed, rattle, crucifers and purple clover.
1% Total Land Pollen) and were dominated by grasses, sedges, Dandelion family, Plantains, Bracken and grains of both arable and pastoral `weeds' including Pheasants Eye (probably a Roman introduction), Corn Chamomile, Cornflower, Pale Persicaria, Bedstraw, Fat Hen, Sheep's Sorrel, Black Knapweed, Knotgrass, members of the Goosefoot family and Cereal types (0.
It is home to rare plants including meadow foxtail, greater bird's-foot-trefoil, red clover, black knapweed, ox-eye daisy and cocksfoot.