Clarkia rostrata is a species of flowering plant in the evening primrose family known by the common name beaked clarkia. It is endemic to California, where it is known from the woodlands of the Sierra Nevada foothills around the Merced River. This annual herb grows erect to about half a meter in maximum height. The lance-shaped leaves are up to about 6 centimeters long. The inflorescence bears opening flowers below closed, hanging flower buds. The reddish or purplish sepals stay fused together as the flower opens from one side. The fan-shaped petals are lavender-pink, lightening to nearly white at the bases, where it turns reddish purple. There are 8 stamens, some tipped with large lavender anthers and some with smaller, paler anthers.