threatened
Spellenberg, R. 1978. Review of federally "threatened" or "endangered" plant species in the Las Cruces district of the Bureau of Land Management, U.S. Dept. of the Interior. June 1978.
U.S. Fish and Wildlife Service (USFWS). 1978. Seven Snails Listed as Endangered or Threatened. Dept. of Interior News Release, July 3, 1978.
Wagner, W.L., and D.G. Sabo. Status report for Lesquerella aurea. U.S. Fish and Wildlife Service, Albuquerque, New Mexico.
U.S. Fish and Wildlife Service. 2000. Federally listed as threatened and endangered species of Texas. March 28, 2000. . 59 p.
Lee-Chadde, S. and L.F. Huenneke. 1997. A handbook of rare, threatened and endangered plant species of the Sacramento Mountains. Dept. of Biology, New Mexico State University, Las Cruces, NM 88003. Draft. pp. 109.
Higgins, L.C. 1989. Guadalupe Mountains National Park threatened and endangered and exotic plant surveys. Report prepared for Guadalupe Mountains National Park.
McCollum, J.L., and D.R. Ettman. 1987. Georgia's protected plants. Georgia Dept. of Natural Resources, and the U.S. Dept. of Agriculture, Soil Conservation Service, Social Circle, GA. 64 pp.
Sivinski, R. 2003. Mesa Verde Cactus: an eighteen-year demographic summary of a waterflow, New Mexico study plot. New Mexico Forestry Division; Santa Fe, New Mexico. 5 p.
Lee-Chadde, S., L. F. Huenneke. 1997. Rare plants of the Sacramento Mountains. Dept. of Biology, New Mexico State University, Las Cruces, NM 88003. Produced for the Rocky Mountain Forest and Range Experiment Station. pp. 114.
Rutman, S. 1992. Handbook of Arizona's endangered, threatened, and candidate plants. U.S. Fish and Wildlife Service, Phoenix, Arizona.