Equisetum ×mackayi auct. non (Newman) Brichan

Equisetum ×mackayi auct. non (Newman) Brichan is a synonym sensu Christenhusz et al., 2019 of:

Equisetum ×jesupii (A.A. Eaton) Christenhusz & Husby, an accepted species name sensu Christenhusz et al., 2019.