Oregon State University. Extension Service; French, Ken; Burrill, L. C.; Butler, Tim, 1958- ([Corvallis, Or.] : Oregon State University, Extension Service, 2006-12)
These thistles are native to Europe and the Middle East.
Some are not true thistles; for example, purple/Iberian and
yellow starthistle actually are knapweeds. All of these plants, however,
share a spiny, thorny, inva ...
