Kincaid’s lupine (Lupinus oreganus) and habitat monitoring at Fir Butte

This report documents work conducted on Kincaid’s lupine (Lupinus oreganus; Figure 1), a rare member of the legume family (Fabaceae) listed by the Oregon Department of Agriculture and the U.S. Fish and Wildlife Service as a threatened species. Kincaid’s lupine is found in native prairie remnants in the Willamette Valley, southwestern Washington, and forest openings in Douglas County, Oregon. In the Willamette Valley, Kincaid’s lupine serves as a larval host plant for the rare Fender’s blue butterfly (Icaricia icarioides fenderi), making conservation of the lupine a common strategy for the success of both species.

This report summarizes the results of monitoring Kincaid’s lupine and the plant community at Fir Butte in 2011. Specifically, we (1) summarize the abundance of Kincaid’s lupine in 2011 and long term population trends, (2) briefly review the effectiveness of mowing and burning as management treatments, and (3) summarize the plant community composition and the utility of using quadrat vs. point-intercept sampling