lack yellow pigments altogether. The former is characterized by the green-petaled form described by Torrey while the latter includes a white-flowered form of T. chloropetalum distinguished from T. albidum by the presence of dark purple stamens and carpels. Freeman's treatment of Trillium chloropetalum is widely (if not universally) accepted. Some authorities consider Trillium chloropetalum var. giganteum to be a synonym for Trillium chloropetalum, but even those authorities cite Freeman. Distribution and habitat Trillium chloropetalum is endemic to California. Some authorities claim the species ranges across ten California counties, from Monterey County on the central California coast to Lake County in the north central part of the state: Alameda, Contra Costa, Lake, Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz, Sonoma Other authorities claim that T. chloropetalum has a broader range that extends northward to Siskiyou County or southward to Santa Barbara County. T. chloropetalum is found at the edges of redwood forests and chaparral, usually on moist slopes, canyon banks, and alluvial soils. Uses The variety Trillium chloropetalum var. giganteum, with its deep maroon flower petals, gained the Award of Garden Merit (AGM) from the Royal Horticultural Society in 1993. Gallery See also Pacific Railroad Surveys Bibliography References External links Calflora Database: Trillium chloropetalum (Giant wakerobin) Biodiversity Information Serving Our Nation (BISON) occurrence data and maps for Trillium chloropetalum Biodiversity Information Serving Our Nation (BISON) occurrence data and maps for Trillium chloropetalum var. chloropetalum Biodiversity Information Serving Our Nation (BISON) occurrence data and maps for Trillium chloropetalum var. giganteum chloropetalum Endemic flora of California Flora of the Sierra Nevada (United States) Natural history of the California chaparral and woodlands Natural history of the California Coast Ranges Natural history of the San Francisco Bay Area Plants described in 1857 Taxa named by John Torrey Taxa named by John Thomas Howell