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CCDB → Angiosperms → Cactaceae → Opuntia → Opuntia phaeacantha var. nigricans Engelm.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Opuntia phaeacantha var. nigricans Engelm. | Opuntia phaeacantha Engelm. | 33 | IPCN online | Pinkava, D. J. & B. D. Parfitt. 1982. Chromosome numbers in some cacti of western North America IV. Bull Torrey Bot. Club. 109: 121–128. |