Las Vegas buckwheat, Eriogonum corymbosum, var. nilesii, is a Federal candidate for listing as threatened or endangered. Originally known only from the vicinity of Las Vegas, Nevada, it is now known in Kane and Washington counties, Utah, and Coconino County, Arizona.
Having only recently been documented as present in Kane and Washington counties, there is no detailed information on habitat or potential impacts. The following is from Mrowka (2008):
“The Las Vegas buckwheat (Eriogonum corymbosum var. nilesii) is a woody perennial shrub up to 4 feet (ft) high with a mounding shape. The subspecies is distinguished from closely related taxa by leaves that are densely hairy on one or both surfaces, at least twice as long as wide, with dense hairs spread along the stem. The branches are wooly haired and swollen at branch intersections. The inflorescences are 1 to 4 inches (in) long with the flowers arranged in umbrella-like clusters (corymbs) at the end of branches. The inflorescence branches are divaricate, rigid, and sometimes spinescent. The numerous flowers are small and yellow with small bract like leaves at the base of each flower. This plant is very conspicuous when flowering in late September and early October.”