The white-margined penstemon (Penstemon albomarginatus) grows in four distinct population centers: Clark and Nye counties in Nevada; San Bernardino County in California; and Arizona’s Mohave County.

The white-margined penstemon is a rare low-growing perennial wildflower that ... The Railroad Valley toad is a small amphibian that lives in a single spring-fed wetland complex in Nye County, Nevada.