Equisetum hyemale var. jesupi (A.A. Eaton) Victorin
Equisetum hyemale var. jesupi (A.A. Eaton) Victorin is a synonym sensu Hassler & Schmidt, 2014+ of:
Equisetum ×jesupii (A.A. Eaton) Christenhusz & Husby, an accepted species name sensu Christenhusz et al., 2019.