Sidalcea hartwegii is a species of flowering plant in the mallow family known by the common names valley checkerbloom and Hartweg's checkerbloom. Distribution The plant is endemic to California, where it grows in the Sacramento Valley and adjacent foothills of the California Coast Ranges to the west, and of the Sierra Nevada to the east. It can be found in oak woodland and grassland habitats below , sometimes on serpentine soils. Description Sidalcea hartwegii is an annual herb that produces a slender stem up to tall, mostly hairless with occasional branching hairs. The leaf blades are deeply divided into five to seven narrow linear lobes. The inflorescence is a clustered panicle of four to six flowers, each with five purplish pink petals about 2 centimeters long. The bloom period is May and June. References External links Calflora Database: Sidalcea hartwegii (Hartweg sidalcea, Hartweg's checkerbloom, Valley checkerbloom) Jepson Manual eFlora (TJM2) treatment of Sidalcea hartwegii USDA Plants Profile for Sidalcea hartwegii UC CalPhotos gallery: Sidalcea hartwegii hartwegii Endemic flora of California Natural history of the California chaparral and woodlands Natural history of the Central Valley (California) Natural history of the California Coast Ranges Flora of the Sierra Nevada (United States) ~ Flora without expected TNC conservation status