PROTECTING WISCONSIN'S BIODIVERSITY

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

Western Jacob's Ladder (Polemonium occidentale ssp. lacustre)

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Photo by Stephen L. Solheim

 

Counties with Mapped NHI Occurrences

Western Jacob's Ladder (Polemonium occidentale ssp. lacustre), a Wisconsin Endangered plant, is found in open cedar swamps, as well as cold, seeping calcareous conifer swamps. Blooming occurs throughout July, fruiting throughout August. The optimal identification period for this species is throughout July.

Polemonium occidentale ssp. lacustre

 
 
 

Western Jacob's ladder is an erect forb with a compact panicle inflorescence, the pedicels at peak flowering are shorter than the calyx. Its flowers are mostly blue, crowded in a typically elongate and somewhat thyrse-like inflorescence. Corolla is 10-16mm, fully as wide, lobes are longer than the tube, stamens about equal or are a little shorter than the corolla, the style conspicuously surpasses the stamens. It has 1-10 seeds per locule, sometimes becoming mucilaginous when wet. Leaves are alternate, pinnately compound or very deeply pinnatifid. The lower leaves have 1-27 leaflets, 1-4cm, the middle and upper are smaller.

Rhizomatous. Blooming occurs throughout July, fruiting throughout August.

Perennial. The optimal identification period for this species is throughout July.

Associated species include Larix laricina, Thuja occidentalis, Picea mariana, Valeriana sitchensis ssp uliginosa, Carex tenuiflora, C gynocrates, C lacustris, Saxifraga pensylvanica, Calla palustris, Equisetum fluviatile, and Alnus rugosa.

Western Jacob's ladder is found in open cedar swamps, as well as cold, seeping calcareous conifer swamps.

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 site preparation that heavily disturbs herbaceous ground layer and soil, including bulldozing and furrowing, as well as grubbing and stump removal.

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.

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

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.