Ross, D. Black, K. Koehn, G. Kilday, L. Kastner, R. Shanks, B. Lawrence, J. Mercurio, C. (1998) Sensitive Plant Site Report, Population Site Report, Lincoln National Forest, Field Notes. Guadalupe Ranger District, Lincoln National Forest, USFS. 4 p.

• Echinocereus fendleri var. kuenzleri