PROTECTING WISCONSIN'S BIODIVERSITY

 
 
   
 
Scientific Name Common Name Global Rank State Rank Federal Status WI Status

Marsh Horsetail (Equisetum palustre)

EQUPAL_EJJ.jpg

 

 

 

 

9051.jpg

Photo by Emmet Judziewicz

 

Counties with Mapped NHI Occurrences

Marsh Horsetail (Equisetum palustre), a Wisconsin Special Concern plant, is found in fens, alder tickets, wet sedge meadows, bog and swamp margins, and wet swales near the Great Lakes. The optimal identification period for this species is late-May through September.

Equisetum palustre var. americanum

 
 
 

Marsh horsetail is a fern ally, 2-8dm tall, that has cones with peduncle, 9-35mm long, and blunt. Its leaf-like branches are occasionally in whorls at middle and upper nodes. Its stem has 5-10 ridges.

It can be distinguished from other Equisetum species by its whorled branches in which the first internode of the branch is shorter than the adjacent sheath. It can be distinguished from E fluviatile because it has fewer ridges (usually less than 10) on its stem.

Rhizomatous. Blooming occurs in May, fruiting June through August.

Perennial/annual. The optimal identification period for this species is late-May through September.

Associated species include Carex lacustris, Sphagnum species, Calamagrostis canadensis, Larix laricina, Juncus canadensis, and Thuja occidentalis.

Marsh horsetail prefers wet, often calcareous soils and is found in fens, alder tickets, wet sedge meadows, bog and swamp margins, and wet swales near the Great Lakes.

Avoid known individual plant locations and conduct operations elsewhere when they are least likely to cause damage. Ideally, this would involve frozen, snow-covered ground. However, in areas of the state where frozen conditions are unreliable, very dry soils late in the growing season might be the best available alternative. Consult with a biologist, if needed.

Avoid broadcast spraying of herbicides and use care with spot spraying.

Minimize disturbance to hydrology, including soil disturbance from rutting.

Avoid rapid and dramatic reductions in canopy cover and, basal area, in wet areas to reduce risk of swamping.

Survey for and control invasive plants prior to conducting timber operations, as these can be spread by vehicles and often respond vigorously to increased light. See forestry BMPs for invasive species.

Species of Greatest Conservation Need (SGCN) are associated with habitats (or natural communities) and places on the landscape. Understanding relationships among SGCN, natural communities and ecological landscapes help us make decisions about issues affecting SGCN and their habitat and how to respond. Download the Wildlife Action Plan association score spreadsheet to explore rare species, natural communities and ecological landscape associations

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the Wisconsin Wildlife Action Plan because lack of information can threaten our ability to successfully preserve and care for natural resources.