Equisetum hyemale var. affine (Engelmann) A.A. Eaton

Equisetum hyemale var. affine (Engelmann) A.A. Eaton is a synonym sensu FNA Ed. Comm., 1993 of:

Equisetum hyemale subsp. affine (Engelmann) Calder & Roy L. Taylor, an accepted subspecies name sensu FNA Ed. Comm., 1993.