Lomatium cous (cous biscuitroot) is a perennial herb of the family Apiaceae. The root is prized as a food by the tribes of the southern plateau of the Pacific Northwest. Meriwether Lewis collected a specimen in 1806 while on his expedition.[1]
It is called x̣áwš in the Sahaptin language, and qáamsit (when fresh) and qáaws (when peeled and dried) in the Nez Perce language.
It is called shappelell by the Chinooks: "... and a kind of bisquit, which the natives make of roots called by them shappelell."—Meriwether Lewis, Friday, January 9, 1806. From The Definitive Journals of Lewis & Clark, Down the Columbia to Fort Clatsop. Volume 6 of the Nebraska Edition. Gary E. Moulton, Editor. University of Nebraska Press, Lincoln, 1990.