cactus collection

Heil, K.D. 1985. Recovery plan for the Knowlton cactus Pediocactus knowltonii L. Benson. Prepared for the U.S. Fish and Wildlife Service, Region 2. Albuquerque, NM. 59 pp.

• Pediocactus knowltonii
• cactus collection
• cactus poaching

Stafford, R. 1989. Botanists find cactus better neighborhood. Plant Conservation 4(1): 3.

• cactus collection
• cactus poaching
• Pediocactus knowltonii