Cyanea recta is a rare species of flowering plant in the bellflower family known by the common names upright cyanea and Kealia cyanea. It is endemic to Hawaii, where it is known only from the island of Kauai. It is a federally listed threatened species of the United States. Like other Cyanea it is known as haha in Hawaiian.
Cyanea remyi is a rare species of flowering plant in the bellflower family known by the common name Remy's cyanea. It is endemic to Hawaii, where it is known only from the island of Kauai. It is a federally listed endangered species of the United States. Like other Cyanea, it is known as haha in Hawaiian.
Cyperus trachysanthos is a rare species of sedge known by the common names pu`uka`a and sticky flatsedge. It is endemic to Hawaii, where it is known from Kauai and Oahu. It was known from Niihau, Molokai and Lanai, but it has been extirpated from these islands. It is a federally listed endangered species of the United States.
Cyrtandra cyaneoides is a rare species of flowering plant in the African violet family known by the common name māpele. It is endemic to Kauaʻi in Hawaiʻi, where it is known from eleven populations containing a total of under 800 individual plants. Several of these were discovered between 2003 and 2008. It is a shrub that grows 1 to 6 meters tall, bears white flowers, and egg-shaped berries. It was federally listed as an endangered species in 1996.
Cyrtandra oenobarba is a rare species of flowering plant in the African violet family known by the common name shaggystem cyrtandra. It is endemic to Hawaii, where it is known only from the island of Kauai. It can be found in only three localized areas of the island and there are fewer than 500 individuals remaining in the wild. It was federally listed as an endangered species in 2010. Like other Hawaiian Cyrtandra it is called ha`iwale.
Diplazium molokaiense is a rare species of fern known by the common name Molokai twinsorus fern. It is endemic to Hawaii, where it is one of the rarest ferns. It has historically been found on the islands of Kauai, Oahu, Lanai, Molokai, and Maui, but it is thought to have been extirpated from four of them and today can be found only on Maui where fewer than 70 individual plants remain. The fern was federally listed as an endangered species of the United States in 1994.
Dubautia plantaginea is a rare species of flowering plant in the aster family known by the common name plantainleaf dubautia. It is endemic to Hawaii where it is the only member of the silversword alliance that is found on all six of the largest islands. Two of the three subspecies are rare and endangered. Like other Dubautia this plant is called na`ena`e.
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.
Cyperus pennatiformis is a rare species of sedge known by the common name coastal flatsedge. It is endemic to Hawaii, where it grows on the islands of Maui, Kauai, and Laysan. It is a federally listed endangered species of the United States.
Panicum niihauense is a rare species of grass known by the common names lau 'ehu and Niihau panicgrass. It is endemic to Hawaii, where it has been found on the islands of Niihau and Kauai. It has not been observed on Niihau since 1949, and there are fewer than 40 individuals remaining on Kauai, not counting a few individuals that have been deliberately planted in appropriate habitat. The grass is a federally listed endangered species of the United States.
Peristylus holochila is a rare species of orchid known by the common name Hawaii bog orchid. It is endemic to Hawaii. It is a federally listed endangered species of the United States.
Poa mannii is a rare species of grass known by the common names Mann's bluegrass and Olokele Gulch bluegrass. It is endemic to Hawaii, where it is limited to the island of Kauai. It is threatened by the loss and modification of its habitat. It is a federally listed endangered species of the United States.
Poa sandvicensis is a rare species of grass known by the common name Hawaiian bluegrass. It is endemic to Hawaii, where it is limited to the island of Kauai. It is threatened by the loss and modification of its habitat. It is a federally listed endangered species of the United States.
Remya mauiensis is a rare species of flowering plant in the family Asteraceae known by the common name Maui remya. It is endemic to Hawaii, where it is known only from the island of Maui. It is threatened by the degradation of its habitat. It is a federally listed endangered species of the United States.
Remya montgomeryi is a rare species of flowering plant in the family Asteraceae known by the common name Kalalau Valley remya. It is endemic to Hawaii, where it is known only from the island of Kauai. It is threatened by the degradation of its habitat. It is a federally listed endangered species of the United States.
Schiedea helleri is a rare species of flowering plant in the family Caryophyllaceae known by the common names Heller's schiedea and Kaholuamanu schiedea. It is endemic to Hawaii, where it is known only from the island of Kauai. It is threatened by the degradation of its habitat. It was federally listed as an endangered species of the United States in 1996.
Schiedea spergulina is a rare species of flowering plant in the family Caryophyllaceae known by the common name canyon schiedea and spreading schiedea. It is endemic to Hawaii, where it is known only from the island of Kauai. It is threatened by the degradation and destruction of its habitat. There are two varieties of this plant, one federally listed as an endangered species of the United States, and the other listed threatened.
Schiedea stellarioides is a rare species of flowering plant in the family Caryophyllaceae known by the common name lau lihilihi. It is endemic to Hawaii, where it is known only from the island of Kauai. It is threatened by the degradation and destruction of its habitat. The plant is federally listed as an endangered species of the United States.
Silene lanceolata is a rare species of flowering plant in the family Caryophyllaceae known by the common names Kauai catchfly and lanceolate catchfly. It is endemic to Hawaii, where it is known only from Oahu, Molokai, and Hawaii, having been extirpated from Kauai and Lanai. It is threatened by the degradation of its habitat and it is a federally listed endangered species of the United States.
Solanum incompletum is a rare species of flowering plant in the family Solanaceae known by the common names thorny popolo and popolo ku mai. It is endemic to Hawaii, where it occurs today on the islands of Maui, Lanai, and Hawaii. It is threatened by the destruction and degradation of its habitat. It is a federally listed endangered species of the United States.
