Collier's New Encyclopedia (1921)/Knapweed
KNAPWEED, a popular name given to some species of Centaurea. C. nigra, black knapweed; and C. scabiosa, greater knapweed, are common weeds, being rough, hardy herbaceous plants growing by waysides, etc.
Edition of 1921; disclaimer.
KNAPWEED, a popular name given to some species of Centaurea. C. nigra, black knapweed; and C. scabiosa, greater knapweed, are common weeds, being rough, hardy herbaceous plants growing by waysides, etc.