Clements, Upadhyaya & Bos 1999

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Clements, D. R., Upadhyaya, M. K. & Bos, S. J. 1999: The biology of Canadian weeds. 110. Tragopogon dubius Scop., Tragopogon pratensis L., and Tragopogon porrifolius L. In: Canadian Journal of Plant Science. Bd. 79, S. 153–163.



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