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2. Adanick, P., Drezner, T.D. submitted for publication. Substrate Variability and the Distribution of Opuntia cespitosa (Cactaceae) in 250,000 Km2 of their Range.
3. The Cactus Family;Anderson,2001
4. Uniqueness of the endangered Florida semaphore cactus (Opuntia corallicola);Austin;SIDA Contrib. Bot.,1998
5. The Jepson Manual: Vascular Plants of California,2012