[1] Junak, S.A. and D.H. Wilken. 1998. Sensitive plants status survey, Naval Auxiliary Landing Field, San Clemente Island, California. Santa Barbara Botanic Graden,Santa Barbara, CA
[2] Mohlenbrock, R.H. 1983. Where Have All the Wildflowers Gone? A Region-by-region Guide to Threatened or Endangered U.S. Wildflowers. Macmillan Publishing Co. Inc. NY.