Publication: Amer. J. Sci. Arts. 46: 87. 1844.
selected vouchers: WTU
Notes: FNA2: "Schaffner named this species Equisetum kansanum because he applied the name E . laevigatum to what we now know is the hybrid E . × ferrissii . The coarser-stemmed, occasionally persistent forms in the southwestern United States have been called Equisetum funstonii."