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CCDB → Gymnosperms → Zamiaceae → Dioon → Dioon holmgrenii D. Luca & Sabato & V. Torres
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Dioon holmgrenii D. Luca & Sabato & V. Torres | Dioon holmgrenii D. Luca & Sabato & V. Torres | 18 | Rastogi2019 | Moretti A. Karyotype data on North and Central American Zamiaceae (Cycadales) and their phylogenetic implications. Am J Bot. 1990;77:1016–29. |