Hesperomannia arbuscula, the Maui island-aster or Maui hesperomannia, is a species of flowering plant in the family Asteraceae that is endemic to the islands of Oʻahu and Maui in Hawaiʻi. It is found in mixed mesic and wet forests at elevations of 350–900 m (1,150–2,950 ft). It is threatened by habitat loss. There are fewer than 60 plants remaining in the wild.