Equisetum x litorale Kühlew. ex Rupr. (pro sp.)
Family: Equisetaceae
littoral horsetail, shore horsetail
Equisetum x litorale image
Robert H. Read  
Etymology: Equisetum: Latin for "horsetail" from equus, "horse," and seta, "bristle"
Plants: perennial fern ally
Habitat: wet ground
Conservation Status: Native