Equisetum hyemale L. var. affine (Engelm.) A.A. Eaton in Schoorl
Gorteria Dutch Botanical Archives , Volume 22 - Issue 6 p. 162- 164
A giant form of the Northamerican Equisetum hyemale var. affine has been planted a decade ago near the coast, where it has naturalized since. It is suggested that other Northamerican introductions of this extremely variable taxon may have remained unnoticed.
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