Horsetail (Equisetum, Equisetaceae) in commerce and exported from Peru

Several plant products are exported from Peru as food supplements (nutraceuticals), condiments and other uses for human consumption, among them the horsetail fern. Three names are used in commerce: Equisetum arvense, E. bogotense and "E. hiemale"; none of which represent the species being exported; instead the species in commerce is E. giganteum, easily recognizable by morphological details of their axes, ornamentation and stomata distribution.