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CCDB → Angiosperms → Plantaginaceae → Pennellianthus → Penstemon frutescens Lamb.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Penstemon frutescens Lamb. | Pennellianthus frutescens Crosswhite | 40 | Fedorov, 1974 | Sakai K. 1934 | |||
| Penstemon frutescens Lamb. | Pennellianthus frutescens Crosswhite | 40 | Fedorov, 1974 | Matsuura. SutO 1935 ( |