Edward Leonard Caum

Amaranthus brownii was an annual herb in the family Amaranthaceae. The plant was found only on the small island of Nīhoa in the Northwestern Hawaiian Islands, growing on rocky outcrops at altitudes of 120–215 m (394–705 ft). It was one of nine species of Amaranthus in the Hawaiian Islands, as well as the only endemic Hawaiian species of the genus. It is now considered extinct. A. brownii was first discovered during the Tanager Expedition in 1923 by botanist Edward Leonard Caum. It differed from other Hawaiian species of Amaranthus with its spineless leaf axils, linear leaves, and indehiscent

Abutilon eremitopetalum, commonly known as the hidden-petaled abutilon or hiddenpetal Indian mallow, is a species of flowering shrub in the mallow family, Malvaceae. It is endemic to dry forests and low shrublands on the windward side of the island of Lānaʻi in Hawaii. It is classified by the IUCN Red List as critically endangered by habitat destruction. The species was first discovered in 1987.

Pteralyxia kauaiensis, also called Kaulu or Kauaʻi pteralyxia, is a species of plant in the family Apocynaceae. It is endemic to the island of Kauaʻi in the Hawaiian Islands. It is threatened by habitat loss and degradation. There are no more than 1000 individuals remaining. It is federally listed as an endangered species of the United States.

Schiedea kealiae is a rare species of flowering plant in the family Caryophyllaceae known by the common name Waianae Range schiedea. It is endemic to Hawaii, where it is known only from the Waianae Range on the island of Oahu. It is threatened by the degradation and destruction of its habitat. It was federally listed as an endangered species of the United States in 1996. This plant is a subshrub with woody-based, hairless branches up to half a meter long. The oppositely arranged leaves have narrow, dark green blades up to 8 centimeters long by 1.1 wide. The inflorescence is a branching

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