Erling Christophersen

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 sandwicense, commonly known as the greenflower Indian mallow, is a species of flowering plant in the mallow family, Malvaceae, that is endemic to the island of Oʻahu, Hawaii, in the United States. It inhabits dry forests on the slopes of the Waiʻanae Range at elevations of 400–600 m (1,300–2,000 ft). Associated plants include lama (Diospyros sandwicensis), ēlama (D. hillebrandii), māmaki (Pipturus albidus), kalia (Elaeocarpus bifidus), āulu (Sapindus oahuensis), olopua (Nestegis sandwicensis), and alaheʻe (Psydrax odorata). Greenflower Indian mallow is a shrub, reaching a height of

Alternanthera echinocephala, known as spiny-headed chaff flower, is a shrubby plant in the family Amaranthaceae native to the Galápagos Islands, mainland Ecuador, and Peru. Its relatively large spiny "heads" of flowers distinguish it from other species of Alternanthera found in the Galápagos.

Callitriche christensenii is a species of plant in the family Plantaginaceae. It is a hydrosubshrub endemic to Tristan da Cunha. Its natural habitats are rivers, freshwater marshes, and freshwater springs.

Rostkovia tristanensis is a species of flowering plant in the family Juncaceae, the rushes. It is endemic to Tristan da Cunha, where it occurs only on the main island and Gough Island. It grows in heath habitat with Empetrum. It is not uncommon on Gough Island, but it is rarely seen in flower.

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