PROTECTING WISCONSIN'S BIODIVERSITY

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

Slender Bog Arrow-grass (Triglochin palustris)

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Photo by Ryan O'Connor

 

Counties with Mapped NHI Occurrences

Slender Bog Arrow-grass (Triglochin palustris), a Wisconsin Special Concern plant, is found on calcareous, moist, open sites, especially fens and lakeshores, as well as in damp areas near sand dunes along the Great Lakes. Blooming occurs throughout July, fruiting throughout August. The optimal identification period for this species is early-July through August.

Triglochin palustre

 
 
 

Slender bog arrow-grass is an erect forb with bisexual flowers with 6 tepals, 1-1.5 mm, 6 stamens, and 3 stigmas. Its fruits are in clusters of 3, tapered to the base, with a winged central axis, 3 individual ovaries, 6-9 mm each, sharply pointed at base, not rounded. Leaves are 1-2mm wide and up to 3dm long.

Blooming occurs throughout July, fruiting throughout August.

Perennial. The optimal identification period for this species is early-July through late-August.

Associated species include Carex interior, other Carex species, Potentilla palustris, P anserina, Drosera intermedia, Lycopus americanus, Lobelia kalmii, Eleocharis quinqueflora, Hypericum kalmianum, Gentianopsis procera, and Juncus balticus.

Slender bog arrow-grass is found on calcareous, moist, open sites, especially fens and lakeshores, as well as in damp areas near sand dunes along 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.

Prescribed burns and/or brushing may be beneficial, dependent on local site conditions and burn frequency. Rotational burns with annual unburned refugia may be preferred.

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.

This species is likely sensitive to water quality. Following BMPs around streams and buffering associated drainages will reduce eutrophication and prevent water quality degradation.

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.