Erythranthe primuloides is a perennial herb growing in low patches or mosslike mats and spreading via
rhizome and
stolon. The stem is no more than about 12 centimeters long. The oppositely arranged leaves are variable in shape, variable in color from green to purple-green, shaggy-hairy to hairless, and up to 5 centimeters long. The flower arises on an erect
pedicel. The tubular base of the flower is encapsulated in a hairless calyx of
sepals. The bright yellow flower is up to 2 centimeters long. It is divided into an upper lip with two lobes and a lower lip with three. Each of the three lower lobes are usually dotted with red. ==References==