Knapweed
Chandler's Encyclopedia · 1898 · p. 38
Centaurea nigra. Purple-flowered weed of the Composite family, native of Europe, introduced into N. America.
Bu kavram başka kaynaklarda da geçiyor
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
An Illustrated Encyclopedic Medical Dictionary (1893)
The Complete Herbal (1840)
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