Penstemon cardinalis
Worthington, R.D. (2007) Lincoln Naional Forest, Inventory Completion Report, Sensitive Plant Survey, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincaoln NF, USFS. 3 p.
Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys. Guadalupe RD, Lincoln NF, USFS. 3 p.
Worthington, R.D. (2007) Lincoln National Forest, Sensitive Plant Site Report, Population Site Report, Field Notes. Population % PECAR-3 Revisit. Guadalupe RD, Lincoln NF, USFS. 3 p.
Worthington, R. (2007) Lincoln National Forest, Inventory Completion Report, Sensitive Plant Survey. Guadalupe Rabbitbrush Survey, Guadalupe RD, Lincoln NF, USFS. 5 p.
Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys. Guadalupe RD, Lincoln NF, USFS. 3 p.
Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Sensitive Plant Survey, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincoln NF, USFS. 3 p.
Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincoln NF, USFS. 4 p.
Worthington, R. 1998. Biotic Assessment of Sitting Bull Falls Recreation Aread and Last Chance Canyon, Guadalupe Mountains, Eddy County, New Mexico. USFS
Barker, Linda M. 2002. Lincoln National Forest inventory completion report, sensitive plant survey field notes for Penstemon cardinalis ssp. cardinalis. 89 p.
Worthington, R.D. (2007). Lincoln National Forest, Sensitive Plant Site Report, Population Site Report, Field Notes. Population # ERNAT-1. Guadalupe RD, Lincoln NF, USFS. 3 p.