Seeds from Lewisia nevadensis. Nevada lewisia is a species of flowering plant in the purslane family. It is native to much of the western United States, where it grows in moist mountain habitats, such as meadows. This is a small perennial herb growing from a taproot and caudex unit. The flower has 5 to 10 shiny white to pale pink petals each 1 to 2 centimeters long. This can be grown as an ornamental plant suitable for alpine and rock gardens but may also be put into containers. Zones 4-8.