Equisetum x ferrissii Clute (pro sp.)  
Family: Equisetaceae
Ferriss' horsetail
[Equisetum hyemale var. elatum L., Equisetum hyemale var. intermedium L., Equisetum intermedium (A.A.Eaton) Rydb.]
Equisetum x ferrissii image
Robert W. Freckmann  
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