Rumex orthoneurus is a species of flowering plant in the knotweed family known by the common names Chiricahua Mountain dock and Blumer's dock. It is native to western North America, where it can be found in Arizona, New Mexico, and Sonora. This species grows in mountain and forest wetland habitat, such as meadows and streambanks. It may grow alongside Rumex occidentalis, a closely related species often confused with it. Other species in the habitat include Helenium hoopesii, Carex spp., and Juncus spp.