- Centaurea nigra L. - Common Knapweed - Compositae / Asteraceae
© Fiona McCrory
(Map updated: March 2008)
A very common pernnial of grassy places; tall (up to about 2 feet) with blue thistle-like flower heads and narrow-oval leaves.
All names: Centaurea nigra L.; Centaurea nemoralis Jordan; Centaurea nigra ssp. nemoralis (Jordan) Gremli; Centaurea dedeauxii ssp. nemoralis (Jordan) Dostal; Centaurea obscura Jord.