Erigeron ovinus is a rare North American species of flowering plant in the daisy family, called the sheep fleabane. It is has been found only in the southeastern part of the US State of Nevada (Clark County + Lincoln County). The oldest name for this plant is Erigeron caespitosus subsp. anactis. Conquist in 1947 sought to raise this from subspecies to the level of species, but opted to forgo the common (but not mandatory) practice of using the subspecific epithet as a species epithet. He chose a new epithet instead, ovinus.