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[Andrea B.]

Blum, A.G. (2013). Leaves & Stem of Equisetum arvense L. (Equisetaceae). Field Horsetail. Plant photographed in ultraviolet and visible light. http://www.ultraviol...-stem/#entry193
Seal Cove, Mount Desert Island, Maine, USA
17 July 2012
Wild Specimen

Reference:
1. Mittelhauser et al. (2010) Field Horsetail, page 371. The Plants of Acadia National Park. The U. of Maine Press, Orono, ME.