References

For Opuntia

Adanick, P., and M.E. Medley. 2020. Opuntia humifusa sensu stricto (Cactaceae): New to Kentucky (U.S.A.) and confirmed in the Unglaciated Appalachian Plateaus. J. Bot. Res. Inst. Texas 14: 141-146. Google Scholar

Anderson, E.F. 2001. The cactus family. Timber Press, Portland, OR. Google Scholar

Barthlott & Hunt. 1993. In Kubitzki, K., J.G. Rohwer, and V. Bittrich, eds. 1993. The families and genera of vascular plants. II. Flowering plants – Dicotyledons – Magnoliid, Hamamelid and Caryophyllid families. Springer, Berlin. 653 pp. Google Scholar

Benson, L. 1982. The cacti of the United States and Canada. Stanford Univ. Press, Stanford, California. Google Scholar

Britton, N.L., and J.N. Rose. 1937. The Cactaceae: descriptions and illustrations of plants of the Cactus Family. Carnegie Inst. Publ. # 248, Washington, DC, USA. Google Scholar

Doyle, J.D. 1990. Systematics of the Opuntia humifusa complex. Ph.D. dissertation, University of North Carolina at Chapel Hill. Google Scholar

Majure, L.C. 2012. The Evolution and systematics of the Opuntia humifusa complex. Ph.D. Dissertation. Univ. of Florida. Gainesville. Google Scholar

Majure, L.C. 2014. Typifications and a nomenclatural change in some eastern North American Opuntia (Cactaceae). Phytoneuron 2014-106: 1-2. Google Scholar

Majure, L.C., and R. Puente. 2014. Phylogenetic relationships and morphological evolution in Opuntia s. str. and closely related members of tribe Opuntieae. Succulent Plant Research 8: 9-30. Google Scholar

Majure, L.C., W.S. Judd, P.S. Soltis, and D.E. Soltis. 2012a. Cytogeography of the Humifusa clade of Opuntia s.s. Mill. 1754 (Cactaceae, Opuntioideae, Opuntieae): correlations with pleistocene refugia and morphological traits in a polyploid complex. Comparative Cytogenetics 6: 53-77. Google Scholar

Majure, L.C., W.S. Judd, P.S. Soltis, and D.E. Soltis. 2017. Taxonomic revision of the Opuntia humifusa complex (Opuntieae: Cactaceae) of the eastern United States. Phytotaxa 290 (1): 001-065. Google Scholar

Pinkava, D.J. 2003b. Opuntia. In Flora of North America Editorial Committee. 2003b. Flora of North America north of Mexico. Volume 4, Magnoliophyta: Caryophyllidae, part 1. Oxford Univ. Press, New York, NY. 559 pp. Google Scholar

Pinkava, D.J. 2003e. Nopalea. In Flora of North America Editorial Committee. 2003b. Flora of North America north of Mexico. Volume 4, Magnoliophyta: Caryophyllidae, part 1. Oxford Univ. Press, New York, NY. 559 pp. Google Scholar

Ward, D.B. 2009e. Keys to the flora of Florida – 23, Opuntia (Cactaceae). Phytologia 91: 383-393. Google Scholar