Sidalcea stipularis is a rare species of flowering plant in the mallow family, known by the common name Scadden Flat checkerbloom.

It is known from only two occurrences on Scadden Flat in the Sierra Nevada foothills, near Grass Valley.

Sidalcea stipularis is a rhizomatous perennial herb, producing a bristle-haired stem up to 65 centimeters tall.

The inflorescence is a headlike cluster of flowers with a cuplike skirt of hairy bracts.

Threats to this rare species include the invasion of Himalayan blackberry (Rubus armeniacus) into its habitat.