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- [3] ULTRASTRUCTURE OF POLLEN OF OPUNTIA-POLYACANTHA CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE, 1974, 52 (02): : 313 - &
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- [5] SYSTEMATICS OF THE OPUNTIA-PHAEACANTHA GROUP IN TEXAS BOTANICAL GAZETTE, 1979, 140 (02): : 199 - 207
- [7] Reproductive biology in the Plains Prickly Pear, Opuntia polyacantha (Cactaceae), in Saskatchewan BOTANY-BOTANIQUE, 2014, 92 (09): : 654 - 654
- [8] HYBRIDIZATION AND VARIATION IN THE OPUNTIA-PHAEACANTHA GROUP IN CENTRAL TEXAS BOTANICAL GAZETTE, 1979, 140 (02): : 208 - 215