Abstract Cymopterus evertii(Evert’s wafer-parsnip) is a regional endemic of northwestern Wyoming and northeastern Utah that was first described as a new species in 1986. The species is currently known from 20 occurrences, 18 of which are found in the Absaroka and Owl Creek mountains and western Bighorn Basin in Hot Springs and Park counties, Wyoming. Based on surveys in 1988 and 1996-98, thecurrent Wyoming population is conservatively estimated at over 30,000 individualsin over 300 acres of habitat. C. evertii typically occurs on sparsely vegetated, montane or alpine rocky slopes and ridgetops of volcanic andesitic soils in the Absaroka and Owl Creek ranges or in openings on sandstone ridges or knolls within limber pine/Rocky Mountain juniper or big sagebrush/Idaho fescue communities in the Bighorn Basin. Populations at higher elevations are largely protected by their ruggedness and inaccessibility, while those in the Bighorn Basin are potentially threatened by development associated with oil and gas development and recreation. At least 8 populations are currently protected in the Washakie Wilderness on Shoshone National Forest or in the BLM Carter Mountain ACEC.This species was formerly a candidate for listing under the Endangered Species Act, but was dropped from consideration due to its low threats and local abundance in the Shoshone National Forest. Although it does not warrant Sensitive designation on BLM lands at present, the plant’s small range and specialized habitat makes it sufficiently vulnerable that it should continue to be monitored for potential downward trends in the future.