Sidalcea oregana var. calva, the Wenatchee Mountains checker-mallow, is a very rare flowering plant variety that occurs only in five locations in the Wenatchee Mountains of Chelan County, Washington, United States. The plant has been placed on the Endangered species list. As of 2004, the population of the species was 11,000 individual plants.
The inflorescence (arrangement of the flowers) consists of one to several loosely flowered racemes (stalked flowers arranged along a single stem) S. oregana var. calva is similar in appearance to S. oregana var. procera, which occurs in the same geographic region. S. oregana var. calva can be distinguished from var. procera by the presence of the hairs on the margins of the calyx lobes and by its large, somewhat fleshy, basal leaves, which are smooth to the touch on both surfaces.