Echinocereus fendleri var. kuenzleri
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Tonne, P. 2009. Results of surveys for Kuenzler's hedgehog cactus (Echinocereus fendleri var. kuenzleri) in the Brokeoff Mountains and western slopes of the Guadalupe Mountains. Natural Heritage New Mexico Publ. No. 09-GTR-355. Natural Heritage New Mexi
Sivinski, R. 1994. Section 6, Segment 8, Annual report of botanical work accomplished by New Mexico Forestry and Natural Resources Dept. for US Fish and Wildlife Service, Albuquerque, NM.
Paul, L.W. 2012. T&E Species Report. Lincoln National Forest, Guadalupe Ranger District; Annual report to USFWS TE-841927. 9 p.