Lewisia congdonii is a perennial herb growing from a short, thick taproot and caudex unit.

It produces a basal rosette of several thick, fleshy leaves with lance-shaped blades tapering down to a long petiole.

Near the flowers are small, pointed bracts tipped with resin glands.

The flower has 6 or 7 petals, each up to about a centimeter in length and lance-shaped with a toothed tip.

Lewisia congdonii is endemic to the Sierra Nevada of California, where it is known from only ten occurrences in the drainage canyons of the Kings and Merced Rivers.