Can Lysichiton and Lewisia both be found in America?
Lewisia Lewisia is a plant genus, named for Meriwether Lewis who encountered the species in 1806. The native habitat of "Lewisia" species is north facing cliffs in the western part of North America. Local Native Americans ate the roots, which have also been used to treat sore throats.
Tilia johnsoni Tilia johnsoni is an extinct species of flowering plant in the family Malvaceae that, as a member of the genus "Tilia", is related to modern lindens (called "limes" in Britain and "basswoods" in the US). The species is known from fossil leaves found in the early Eocene deposits of northern Washington State, United States and a similar aged formation in British Columbia, Canada.