[Wikipedia] Etymology, Uses: Pseudotrillium is a monotypic genus of flowering plant in the family Melanthiaceae. Its sole species, Pseudotrillium rivale, is commonly known as the brook wakerobin.[5] It is endemic to the Siskiyou Mountains of southern Oregon and northern California. The Latin specific epithet rivale means ?growing by streams?, with reference to a preferred habitat.[6] Uses Under its former name, Trillium rivale, this plant has gained the Royal Horticultural Society's Award of Garden Merit.[17][18] Hardy down to ?10 °C (14 °F), it requires a sheltered position in partial or full shade.[17] (link added by Mary Ann Machi)