The flowers of incarvilleas are large for the size of the plant, and brightly coloured. They are widely flared trumpets, a few to each short stem, in the wild appearing in the summer rain after a dry spring. A few species are shrubby, with more flowers to each stem, but smaller.

Incarvillea himalayensis 'Frank Ludlow' is a particularly fine form of a species that is closely related to Incarvillea mairei, with large (up to 8 cm across) flowers, reddish pink with a white throat to the trumpet, and two white flares at the pase of each corolla lobe. It is one of two excellent introductions of the species from one of Sherriff and Ludlow's expeditions.