Tauschia howellii
 Tauschia howellii is a rare species of flowering plant in the carrot family known by the common name Howell's umbrellawort. It is endemic to the Klamath Mountains of far southern Oregon and far northern California where it is limited to nine occurrences in the Siskiyou Mountains. It grows in mountain forests on gravelly granite soils often among stands of Shasta red fir (Abies magnifica var. shastensis). Despite its rarity it is stable and not considered very endangered.