BioImages: The Virtual Field-Guide (UK)
Centaurea nigra L. (Common Knapweed, Lesser Knapweed, Hardheads)
Sets of Photographs
These relate to individual finds ("biological records") of the organism.
Subtaxa (ie subgroups of this Species)
Centaurea nigra may be covered by literature listed under:
BioInfo (www.bioinfo.org.uk) has 47 feeding and other relationships of Centaurea nigra (Common Knapweed, Lesser Knapweed, Hardheads)