PROTECTING WISCONSIN'S BIODIVERSITY

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

Cooper's Milkvetch (Astragalus neglectus)

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Photo by Emmet Judziewicz

 

Counties with Mapped NHI Occurrences

Cooper's Milkvetch (Astragalus neglectus), a Wisconsin Endangered plant, is found in the woodland-prairie ecotone as well as on riverbanks, ravines, and lakeshores, especially on dolomite near Lake Michigan. Blooming occurs throughout June, fruiting throughout July. The optimal identification period for this species is early-June through July.

 
 
 

Cooper's milkvetch is an erect forb, 30-90cm tall, with a smooth stem, erect in stature, that usually develops a hollow, branchless area in the center. Its inflorescence is made up of several racemes that barely extend past the tallest leaves with white flowers 11-15mm long. Its fruits are sessile, erect, and spindle- or obliquely egg-shaped, 2cm x 8-18mm, inflated like a bladder, and unilocular. Its pinnately compound leaves contain 11-23, oblong to elliptic leaflets that are each 1-3cm long. The undersides are covered in many straight, stiff, and sharp hairs that are pressed flat against the leaves, stipules subtend the leaves free.

It can be distinguished from Astragalus canadensis by its free stipules, vs joined around stem as in A canadensis.

Blooming occurs throughout June, fruiting throughout July.

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

Cooper's milkvetch is found in the woodland-prairie ecotone as well as on riverbanks, ravines, and lakeshores, especially on dolomite near Lake Michigan.

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.

Avoid locating landings, staging areas, or access routes in open sandy areas dominated by native grasses.

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.

Maintain partial canopy to encourage woodland species, avoid closed-canopy conditions.

Silvicultural techniques that result in frequent soil distrubance should be avoided.

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.