This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
A monotypic genus which is closely related to Pentstemon, especially in habit. It differs, however, in the long curved corolla-tube, in the barren stamen being reduced to a scale, and in the cells of the capsule being very unequal in size. The name appears to be derived from banishment or exile, perhaps from the fact of its being a solitary outlier of this affinity.
1. Ph. Capensis. - A glabrous perennial from 1 to 2. feet high with tetragonal erect simple steins, opposite ovate-lanceolate petiolate leaves, and terminal panicles of rosy-red flowers with a yellow throat. It is a native of South Africa, but not of the Cape Colony as the name would imply.