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CCDB → Angiosperms → Plantaginaceae → Penstemon → Penstemon platyphyllus Rydb.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Penstemon platyphyllus Rydb. | Penstemon platyphyllus Rydb. | 16 | IPCN75-78 | Clark 1977 | |||
| Penstemon platyphyllus Rydb. | Penstemon platyphyllus Rydb. | 16 | IPCN73-74 | CLARK, S.L. 197 4. In IOPB chromosome number reports XLIIL. Taxon 23 193-196. |