cob cactus

Castetter, E. F., P. Pierce, and K. H. Schwerin. 1975. A reassessment of the Genus Escobaria. Cactus and Succulent Journal. Vol XLVII. 60-70 pp.

Texas Parks and Wildlife Dept., Resource Protection Division. 1991. Endangered resources annual status report. Texas Parks and Wildlife Department, Austin, TX, 45 pp + appendices.

• Texas
• cob cactus
• element tracking
• natural heritage

Zimmerman, A. D., and B. D. Parfitt. 2006. Flora of North America. Volume 4. Pages 236-237.