Penstemon cardinalis ssp. Regalis

Baker, M. (1999) Multiple Bundled Lincoln National Forest Inventory Completion Reports, Sensitive Plant Surveys, Field Notes. Lincoln Supervisor's Office, Lincoln National Forest, USFS. 54 p.

• Symphyotrichum laeve
• Aquilegia chrysantha var. chaplinei
• Chrysothamnus nauseosus var. texensis
• Penstemon cardinalis ssp. Regalis
• Escobaria sneedii var. leei
• Streptanthus carinatus
• Hexalectris nitida
• Lilium philadelphicum

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.

• 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, Sensitive Plant Survey, 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.

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

Worthington, R.D. (2007) Lincoln National Forest Inventory Completion Report, Sensitive Plant Survey, Field Notes. Guadalupe Rabbitbrush Surveys, 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.

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

Worthington, R.D. (2007) Lincoln National Forest, Sensitive Site Reports, Population Site Report, Field Notes. Population # PECAR-11, Guadalupe RD, Lincoln NF, USFS 3 p.

• Penstemon cardinalis ssp. Regalis

Worthington, R.D. (2007) Lincoln National Forest, Sensitive Plant Site Report, Population Site Report, Field Notes. Population # PECAR-5, Guadalupe RD, Lincoln NF, USFS. 3 p.

• Penstemon cardinalis ssp. Regalis