A Field Guide to the Grasses of New Mexico. Third Edition. Kelly W. Allred. 2005. Agricultural Experiment Station, New Mexico State University, Las Cruces

A Field Guide to the Plants of Arizona. Second Edition. Anne O. Epple. 1997. Falcon Publishing, Helena, Montana

Cacti of Texas: A Field Guide. A. Michael Powell, James F. Weedin and Shirley A. Powell. 2005. Texas Tech University Press, Lubbock

Cacti of the Desert Southwest. Meg Quinn. 2001. Rio Nuevo Publishers, Tucson, Arizona

Cacti of the Trans-Pecos and Adjacent Areas. A. Michael Powell and James F. Weedin. 2004. Texas Tech University Press, Lubbock

Cactus of Arizona Field Guide. Rick Bowers, Nora Bowers and Stan Tekiela. 2008. Adventure Publications, Cambridge, Minnesota

Canyon Country Wildflowers: A Falcon Guide. Damian Fagan. 1998. Globe Pequot Printers, Guilford, Connecticut

Common Flora of the Playa Lakes. David A. Haukos and Loren M. Smith. 1997. Texas Tech University Press, Lubbock

Common Southwestern Native Plants: An Identification Guide. J.L.Carter, M.A. Carter and D.J. Stevens. 2003. Mimbres Publishing, Silver City, New Mexico

Desert Wildflowers of North America. 1998. Taylor, Ronald and Kathleen Ort (editor). Mountain Press Publishing Company.

Ferns and Fern Allies of the Trans-Pecos and Adjacent Areas. Judith D. Springer, Mark L. Daniels and Mare Nazaire. Forward by Bruce E. Babbitt.

Field Guide to Forest and Mountain Plants of Northern Arizona. Sharon C. Yarborough and A. Michael Powell. 2002. Texas Tech University Press, Lubbock

Flora of North America North of Mexico [online]. Flora of North America Editorial Committee, eds. 1993+. 16+ vols. New York and Oxford. Vol. 1, 1993; vol. 2, 1993; vol. 3, 1997; vol. 4, 2003; vol. 5, 2005; vol. 7, 2010; vol. 8, 2009; vol. 19, 2006; vol. 20, 2006; vol. 21, 2006; vol. 22, 2000; vol. 23, 2002; vol. 24, 2007; vol. 25, 2003; vol. 26, 2002; vol. 27, 2007. Flora of North America website.

Flowering Plants of New Mexico. Fifth Edition. R.D. Ivey. 2008. R.D. and V. Ivey, Publishers, 9311 Headingly Court, NE, Albuquerque, New Mexico 87111

Flowers and Shrubs of the Mohave Desert. Janice E. Bowers. 1999. Southwest Parks and Monuments Association, Tucson, Arizona

Flowers of the Southwest Deserts. Nat N. Dodge and Jeanne R Janish (Illustrator). 1985. Southwest Parks and Monuments Association, Tucson, Arizona

Flowers of the Southwest Mountains. Leslie P. Arnberger. 1982. Southwest Parks and Monuments Association, Tucson, Arizona

Little Big Bend: An Introduction to the Common, Uncommon and Rare Plants of Big Bend National Park. Roy Morey. 2008. Texas Tech University Press, Lubbock

Mojave Desert Wildflowers: A Falcon Guide. Pam McKay. 2003. Globe Pequot Printers, Guilford, Connecticut

Mountain Wildflowers of the Southern Rockies. Carolyn Dodson and William W. Dunmire. 2007. University of New Mexico Press, Albuquerque

National Audubon Society Field Guide to North American Trees - Western Region. Elbert L. Little. 1987. Alfred A. Knopf, Inc., New York

National Audubon Society Field Guide to North American Wildflowers - Western Region. Revised Edition. Richard Spellenberg. 2001. Alfred A. Knopf, Inc., New York

Northern Chihuahuan Desert Wildflowers: A Falcon Guide. Steve West. 2000. Globe Pequot Printers, Guilford, Connecticut

River and Desert Plants of the Grand Canyon. 2006. Huisinga, Kristen. Mountain Press Publishing Company.

Rocky Mountain Wildflowers: A Peterson Field Guide. John Craighead, Frank C. Craighead and Ray J. Davis. 1991. Houghton Mifflin, New York

Shrubs and Trees of the Southwest Deserts. Janice E. Bowers and Brian Wignall (Illustrator). 1993. Western National Parks Association, Tucson, Arizona.

Shrubs and Trees of the Southwest Uplands. Francis H. Elmore. 1976. Western National Parks Association, Tucson, Arizona

Sonoran Desert Wildflowers: A Falcon Guide. Richard Spellenberg. 2003. Globe Pequot Printers, Guilford, Connecticut

Southwestern and Texas Wildflowers: A Peterson Field Guide. Theodore F. Niehaus, Charles L. Ripper and Virginia Savage (Illustrator). 1984. Houghton Mifflin, New York

Texas Wildflowers: A Field Guide, Revised Edition. Campbell Loughmiller and Lynn Loughmiller. 2006. University of Texas Press, Austin

The Wild Orchids of Arizona and New Mexico. Ronald A. Coleman. 2002. Cornell University Press, Ithaca, New York

Trees and Shrubs of New Mexico. Jack L. Carter. 1997. Mimbres Publishing, Silver City, New Mexico

Trees and Shrubs of Trans-Pecos and Adjacent Areas. Revised Edition. A. Michael Powell. 1997. University of Texas Press, Austin

Trees of Arizona Field Guide. Stan Tekiela. 2008. Adventure Publications, Cambridge, Minnesota

Trees of the American Southwest. George A. Petrides and Olivia Petrides (Illustrator). 2005. Stackpole Books, Mechanicsburg, Pennsylvania

Western Trees: A Peterson Field Guide. George A. Petrides and Olivia Petrides (Illustrator). 1998. Houghton Mifflin, New York

Wild Orchids of Texas. Joe Liggio and Ann Orto Liggio. 1999. University of Texas Press, Austin

Wildflowers of Southwestern Utah. Revised Edition. Hayle Buchanan. 1992. Bryce Canyon Natural History Association, Bryce Canyon, Utah

Wildflowers of the Desert Southwest. Meg Quinn. 2000. Rio Nuevo Publishers, Tucson, Arizona

Wildflowers of the Mountain Southwest. Meg Quinn. 2003. Rio Nuevo Publishers, Tucson, Arizona

Wildflowers of the Plateau and Canyon Country. Larry Ulrich and Susan Lamb. 1997. Treasure Chest Books, Tuscon, Arizona