black knapweed


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Related to black knapweed: greater knapweed
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.black knapweed - a weedy perennial with tough wiry stems and purple flowersblack knapweed - a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
knapweed - any of various plants of the genus Centaurea having purple thistlelike flowers
References in periodicals archive ?
Collections were also made from species such as black knapweed, betony, common rock rose, woodruff and pig nut.
The walkers stopped to appreciate plants which have colonised abandoned former industrial land, such as willowherb, black knapweed, toadflax, cowslips and tansy.
Other flowers include heath spotted orchids in June, greater bird's foot trefoil and black knapweed in July and fleabane, great burnet and devil's bit scabious in August.