Pennellianthus is a monotypic genus of flowering plants belonging to the family Plantaginaceae.

The genus is within the Tribe Cheloneae along with Penstemon, from which Pennellianthus was separated from.

[3] Its native range is Russian Far East (within the regions of Kamchatka, Khabarovsk, the Kuril Islands, Magadan, Sakhalin) and also Japan.

[1] The genus name of Pennellia is in honour of Francis W. Pennell (1886–1952), an American botanist best known for his studies of the Scrophulariaceae.

[4] The Latin specific epithet of frutescens means shrubby (referring to the habit of the plant).