Camissonia benitensis was discovered by Peter H. Raven on a serpentine stream terrace adajcent to Clear Creek (New Idria serpentine mass; Bureau of Land Management Clear Creek Management Area) in 1960 and scientifically described by him in 1969.
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The southern limit is California State Route 198 (Lat. 36.201109, Lon. -120.734844) between Mustang Ridge and Priest Valley with an estimated actual (true) range being approximately 2.6 miles further southeast (Lat. 36.169849, Lon. -120.710444).