Penstemon cardinalis ssp. Regalis

Worthington, R. 2000. Inventory of the Flora of the New Mexico Portion of the Guadalupe Mountains, Otero and Eddy Counties, New Mexico, Working Second Draft. USFS.

Paul, L. Schmidtkem P. (1999) Inventory Completion Report, Sensitive Plant Survey, Lincoln National Forest, Field Notes. Polk RX Burn, Guadalupe RD, Lincoln NF, USF. 3 p.

• Penstemon cardinalis ssp. Regalis
• Chrysothamnus nauseosus var. texensis

Paul, L. Schmidtke, P. (1999) Inventory Completion Report, Sensitive Plant Survey, Lincoln National Forest, Field Notes. Forest Road 70 Rx Burn. Guadalupe RD, Lincoln NF, USFS. 7 p.

• Chrysothamnus nauseosus var. texensis
• Penstemon cardinalis ssp. Regalis

Unknown, 1980. Guadalupe Mountains, Black canyon, list of plants noted.

• Escobaria sneedii var. sneedii
• Penstemon cardinalis ssp. Regalis
• Valeriana texana

Dunmire, W. W. 1990. An investigation of biological resources focusing on plant and animal communities with recommendations for future management actions, Biological Inventory, Dark Canyon ACEC, Carlsbad Resource Area. Prepared for BLM by TNC Field Office

• Penstemon cardinalis ssp. Regalis
• Perityle quinqueflora
• Salvia summa
• Coryphantha sneedii var. leei
• Epithelantha micromeris
• Mammillaria heyderi
• BUTTON-CACTUS
• LITTLE NIPPLE-CACTUS

Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincoln NF, USFS. 3 p.

• Ericameria nauseosa var. texensis
• Penstemon cardinalis ssp. Regalis

Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincoln NF, USFS. 4 p.

• Ericameria nauseosa var. texensis
• Penstemon cardinalis ssp. Regalis

Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincoln NF, USFS. 3 p.

• Ericameria nauseosa var. texensis
• Penstemon cardinalis ssp. Regalis

Worthington, R.D. (2007) Lincoln National Forest, Inventory Completion Report, Field Notes. Guadalupe Rabbitbrush Surveys: 2007. Guadalupe RD, Lincoln NF, USFS. 3 p.

• Penstemon cardinalis ssp. Regalis
• Ericameria nauseosa var. texensis

Worthington, R.D. (2007) Lincoln National Forest, Sensitive Plant Site Report, Population Site Report, Field Notes. Population # PECAR-4, Guadalupe RD, Lincoln NF, USFS. 3 p.

• Penstemon cardinalis ssp. Regalis