Epixiphium wislizeni, commonly known as baloonbush, is a species of flowering plant in the plantain family, Plantaginaceae. It is the sole species in genus Epixiphium. It is a scrambling or climbing perennial subshrub native to Chihuahua state in northern Mexico and the south western United States (Arizona, California, New Mexico, and Texas) where it grows in sand dunes.^[1] It has tubular flowers in shades of blue to violet and white and more-or-less triangular untoothed leaves.

The species was first described in 1859 as Maurandya wislizeni. In 1926 Philip A. Munz placed it in a separate genus as Epixiphium wislizeni.^[2][1] The species epithet wislizeni commemorates Friedrich Adolph Wislizenus. It is regularly misspelt "wislizenii".