Like most high elevation plants epilobium obcordatum
is a low-growing species, rising just a few inches above the ground in its habitat of rocky slopes and outcrops. Leaves and stems are grey-green in color, and mostly hairless. Stems branch from the base, spreading sideways to form mats. Leaves are numerous; they are circular, or oval with a rounded tip, and usually have a short stalk.
The flowers are relatively large; the five pink petals are up to one inch long, the five sepals about half this length. Petals are evenly colored pink, and they have a notch at the tip. The flower center contains eight stamens, topped by cream-colored anthers, and a four-pronged stigma, higher than the anthers.