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CCDB → Angiosperms → Plantaginaceae → Penstemon → Penstemon isophyllus B. L. Rob.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Penstemon isophyllus B. L. Rob. | Penstemon isophyllus B. L. Rob. | 16 | Cave1963 | Straw 1962 |