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CCDB → Angiosperms → Cactaceae → Echinocactus → Echinocactus horizonthalonius Lem.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Echinocactus horizontalis C. F. Först. | Echinocactus horizonthalonius Lem. | 22 | IPCN online | Weedin, J. F. & A. M. Powell. 1978. Chromosome numbers in Chihuahuan desert Cactaceae. Trans-Pecos Texas. Amer. J. Bot. 65: 531–537. | ||
| ! | Echinocactus horizonthalonius Lem. | Echinocactus horizonthalonius Lem. | 22 | eFlora | |||
| ! | Echinocactus horizonthalonius Lem. | Echinocactus horizonthalonius Lem. | 22 | Fedorov, 1974 | Remski 1954 |