Cyanea longiflora is a rare species of flowering plant in the bellflower family known by the common name ridge rollandia. It is endemic to Oahu where there are only three remaining occurrences in the northern Waianae Mountains for a total of under 300 individuals. It is a federally listed endangered species. Like other Cyanea it is known as haha in Hawaiian.
Cyrtandra dentata is a rare species of flowering plant in the African violet family known by the common names mountain cyrtandra and sharp-toothed cyrtandra. It is endemic to Oahu in Hawaii, where the most recent count estimates 1640 plants occurring in the Waianae Mountains and Koʻolau Mountains. It is a shrub which can reach 5 meters tall and bears white flowers. It was federally listed as an endangered species in 1996. Like other Hawaiian Cyrtandra it is called ha`iwale.
Exocarpos luteolus is a rare species of flowering plant in the sandalwood family known by the common names leafy ballart or heau. It is endemic to Hawaii, where it is known only from the island of Kauai. There are eight populations remaining, for a total global population of only 39 individuals. The plant was federally listed as an endangered species of the United States in 1994.
Gouania meyenii is a rare species of flowering plant known by the common name smoothfruit chewstick. It is endemic to Hawaii, where it is known only from Oahu and Kauai. It is estimated that there are between 38 and 63 individuals of this species remaining in the wild. It is a federally listed endangered species of the United States.
Kadua degeneri is a rare species of flowering plant in the coffee family known by the common names Waianae Range starviolet and Degener's bluet. It is endemic to Hawaii, where it is known only from the island of Oahu. There are four known populations totalling 370 individuals. It is a federally listed endangered species of the United States.
Kadua parvula is a rare species of flowering plant in the coffee family known by the common name rockface star-violet. It is endemic to Hawaii, where it is known only from the Waianae Mountains on the island of Oahu. It is a federally listed endangered species of the United States.
Isodendrion laurifolium is a rare species of flowering plant in the violet family known by the common names rockcliff isodendrion and aupaka. It is endemic to Hawaii, where it is known from fewer than 1000 individuals on the islands of Kauai and Oahu. It is a federally listed endangered species of the United States.
Lepidium arbuscula is a rare species of flowering plant in the mustard family known by the common names `anaunau and Waianae Range pepperwort. It is endemic to Hawaii, where it is known only from the Waianae Mountains on the island of Oahu. In 2003 there were ten populations remaining with fewer than 1000 individuals in total. It is a federally listed endangered species of the US.
Melanthera tenuifolia is a rare species of flowering plant in the family Asteraceae known by the common names Waianae Range nehe and slender-leaf nehe.
Lobelia oahuensis is a rare species of flowering plant in the bellflower family known by the common name Oahu lobelia. It is endemic to Hawaii, where it is known only from the island of Oahu. There are about 100 individuals remaining in the Koʻolau Range, and only one known individual in the Waianae Range. It is federally listed as an endangered species of the United States.
Phyllostegia hirsuta is a species of flowering plant in the mint family known by the common names Molokai phyllostegia and hairy phyllostegia. It is endemic to Hawaii, where it is known only from the island of Oahu. It is a federally listed endangered species of the United States.
Sanicula purpurea is a rare species of flowering plant in the carrot family known by the common names purple-flower black-snakeroot and purple-flowered sanicle. It is endemic to Hawaii, where it is known from Maui and from the Koolau Mountains on the island of Oahu. It is threatened by the degradation of its habitat. It was federally listed as endangered species of the United States in 1996.
Schiedea hookeri is a rare species of flowering plant in the family Caryophyllaceae known by the common names Hooker's schiedea and sprawling schiedea. It is endemic to Hawaii, where it is known only from the island of Oahu. It is thought to have been extirpated from Haleakalā on Maui. 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.
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.
Silene perlmanii is a rare species of flowering plant in the family Caryophyllaceae known by the common name cliff-face catchfly. It is endemic to Hawaii, where it is known only from the southern Waianae Mountains of Oahu. Today there are no plants left in the wild. The species is in cultivation at the National Tropical Botanical Garden. It is a federally listed endangered species of the United States.
Solanum sandwicense is a rare species of flowering plant in the nightshade family known by the common names Hawai'i horsenettle and popolo 'aiakeakua. It is endemic to Hawaii, where it occurs today on the islands of Kauai and Oahu. It is threatened by the destruction and degradation of its habitat. It is a federally listed endangered species of the United States.
Tetramolopium filiforme is a rare species of flowering plant in the family Asteraceae known by the common name ridgetop tetramolopium. It is endemic to Hawaii, where it is known only from the Waianae Mountains on the island of Oahu. It is threatened by habitat degradation caused by feral goats and introduced species of plants. It is a federally listed endangered species of the United States.
Tetramolopium lepidotum is a rare species of flowering plant in the family Asteraceae known by the common name Waianae Range tetramolopium. It is endemic to Hawaii, where today it is known only from the Waianae Mountains on the island of Oahu. It is threatened by habitat degradation caused by feral goats and pigs and introduced species of plants.
Trematolobelia singularis, the lavaslope false lobelia, is a rare species of flowering plant in the bellflower family. It is endemic to Hawaii, where it is known only from the Koʻolau Range on the island of Oahu. It is threatened by the degradation of its habitat. It is a federally listed endangered species of the United States.
Viola chamissoniana is a species of flowering plant in the violet family known by the common name 'olopu. It is endemic to Hawaii, where it is known from the islands of Kauai, Oahu, Molokai, and Maui.
