Centaurea nigra | |
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Scientific classification ![]() | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Asterales |
Family: | Asteraceae |
Genus: | Centaurea |
Species: | C. nigra
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Binomial name | |
Centaurea nigra |
Centaurea nigra is a species of flowering plant in the family Asteraceae known by the common names lesser knapweed, common knapweed and black knapweed. A local vernacular name is hardheads.
It is native to Europe but it is known on other continents as an introduced species and often a noxious weed.
Although the plant is often unwanted by landowners because it is considered a weed by many, it provides a great deal of nectar for pollinators. It was rated in the top five for most nectar production (nectar per unit cover per year) in a UK plants survey.[1] It also placed second as a producer of nectar sugar per floral unit, among the meadow perennials, in another study in Britain.[2]