 Amaranthus brownii is an annual herb in the Amaranthaceae family . The plant is found only on the small island of Nihoa in the Northwestern Hawaiian Islands , growing on rocky outcrops at altitudes of 120 – 215 m ( 394 – 705 ft ) . It is one of nine species of Amaranthus in the Hawaiian Islands , but the only endemic Hawaiian species . It is a member of the tribe Gossypieae , and is a close relative of the genus Gossypium ( cotton ) .
Growth Habit : Erect herb to 1.5 m ( 5 ft ) tall.
Leaves : Opposite