Erigeron basalticus is a species of flowering plant in the aster family known by the common names basalt fleabane and basalt daisy. It is endemic to Washington State in the United States, where it is known only from the banks of the Yakima River and its tributaries in Yakima and Kittitas Counties. This plant grows on basalt cliffs located in and around the Yakima River canyon on the Columbia Plateau in Washington. The whole distribution of the plant is within an area 17 kilometers long by 4.5 wide.