Swallenia is a rare monotypic genus of plants in the grass family, found only in Death Valley National Park, California.

The only known species is Swallenia alexandrae, known by the common names Eureka dunegrass and Eureka Valley dune grass. This genus was named for American botanist Jason Richard Swallen (who specialized in grasses), while the species name was in honor of American philanthropist, museum founder, and paleontologist Annie Montague Alexander.

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