Further reading

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* (in Spanish)
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* (from Ohio State University's )
* (as an invasive species; includes photos)
*Blamey, M., & Grey-Wilson, C. (1989). Flora of Britain and Northern Europe. Hodder & Stoughton.
*Huxley, A., ed. (1992). New RHS Dictionary of Gardening 4: 665. Macmillan.
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External links

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