Joseph Rock

Hibiscadelphus is a genus of flowering plants that are endemic to Hawaiʻi. It is known by the Native Hawaiians as hau kuahiwi which means "mountain Hibiscus". The Latin name Hibiscadelphus means "brother of Hibiscus". It is distinctive for its peculiar flowers, which do not fully open. Hibiscadelphus is in the family Malvaceae, subfamily Malvoideae. Several of the species in this small genus are presumed extinct, as a result of coextinction with their primary pollinators, the Hawaiian honeycreepers.

Pritchardia hardy, the Makaleha pritchardia, is a species of palm tree that is endemic to moist forests on the island of Kauaʻi at elevations below 2,000 feet (610 m). The trunk of this fast-growing species reaches a height of 80 feet (24 m), with a diameter of 1 foot (0.30 m). Its leaves are 3 feet (0.91 m) in length. In 1998 only 30 individuals remained in the wild along a single trail on Kauai. This is a federally listed endangered species of the United States.

Pritchardia munroi, the Kamalo pritchardia, is a species of fan palm that is endemic to Hawaii in the United States. It is found in dry forests on the eastern (leeward) side of the island of Molokaʻi. The specific epithet, refers to James Monro, the manager of the Molokai Ranch at the time of its discovery (1920). Only two individuals exist in the wild, and both are at an elevation of 610 m (2,000 ft). It reaches a height of 4–5 m (13–16 ft) and a trunk diameter of 20 cm (7.9 in).

Hibiscadelphus wilderianus, also known as the Maui hau kuahiwi, is an extinct species of flowering plant in the family Malvaceae that was endemic to the island of Maui in Hawaii. In 2019, American biotechnology company Ginkgo Bioworks recreated the scent of Hibiscadelphus wilderianus's flower for a commercial fragrance line using DNA sequenced from the sole existing herbarium specimen.

Hibiscadelphus hualalaiensis (Hualalai hau kuahiwi) is a species of flowering plant in the mallow family Malvaceae that is endemic to the Big Island of Hawaii.

Pritchardia viscosa, the stickybud pritchardia or loʻulu, is an extremely rare endangered species of Pritchardia palm that is endemic to the Hawaiian island of Kauaʻi. It inhabits open wet forests in the Kalihiwai Valley, where it grows at altitudes of 500–700 m (1,600–2,300 ft). Associated plants include ʻaiea (Ilex anomala), ʻahakea (Bobea spp.), hame, (Antidesma spp.), hāpuʻu pulu (Cibotium glacum), and kōpiko (Psychotria hexandra). It is a medium-sized palm from 6–8 m (20–26 ft) tall, with palmate (fan-shaped) leaves about 1 m (3.3 ft) long. The fruit is produced in dense clusters, each

Pritchardia kaalae, also known as Waianae Range pritchardia or loulu palm, is a species of palm tree that is endemic to the western part of the island of Oʻahu in Hawaiʻi. It grows near springs in the dry forests on the Waiʻanae Range at elevations up to 2,500 feet (760 m). This slow growing species reaches a height of 25 feet (7.6 m), with a trunk diameter of 1 foot (0.30 m). In 1998 there were fewer than 130 individuals remaining in the wild. This has been a federally listed endangered species of the United States since 1996. Etymology The scientific name Pritchardia kaalae honors William

Pritchardia glabrata is a species of palm tree. It is endemic to the island of Maui in Hawaii. It grows at around 500–550 metres A.S.L. It grows on steep slopes between 300 and 900 metres (1000 and 3000 feet) above sea level on the Hawaiian Islands of Maui and Lanai, which are slightly drier. This is one of the small Pritchardia, with a slender trunk rarely reaching five meters (17 feet) in length, but otherwise similar to P. remote and P. waialealeana, with which it shares the same sort of simple trunk.

Hibiscadelphus giffardianus (Kilauea hau kuahiwi) is a species of flowering plant in the mallow family Malvaceae that is endemic to the Big Island of Hawaii.

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. The plant grows in wet forest habitat, sometimes on cliffs or next to streams. It grows alongside other native plants such as ʻākōlea (Boehmeria

Cyanea hardyi, known in Hawaiian as hāhā, is a species of flowering plant in the bellflower family, Campanulaceae. This Hawaiian lobelioid is endemic to southern Kauaʻi. It inhabits forested valleys up to an elevation of 790 m (2,590 ft).

Clermontia peleana is a rare species of flowering plant in the bellflower family known by the common name Pele clermontia. It is one of several Hawaiian lobelioids in genus Clermontia that are known as `oha wai. This plant is endemic to the island of Hawaii, where it is known from a few individuals. It is a federally listed endangered species of the United States. There are two subspecies. When the plant was placed on the endangered species list, only subsp. peleana was believed extinct, and it was known from eight remaining wild plants. The last of the eight died in the year 2000, and the

Pritchardia forbesiana, the Mt. Eke pritchardia, is a species of palm tree. It is endemic to the island of Maui in Hawaii. It grows in forests. Populations are recovering since the removal of destructive feral pigs.

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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. About 100 individuals are 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. This plant grows almost exclusively on the high, exposed main ridge of the mountains, where its habitat is wet shrublands on the windy slopes up to the ridgelines of the cloud zone. It is threatened by habitat degradation and

Cyrtandra tintinnabula is a rare species of flowering plant in the African violet family known by the common name Laupahoehoe cyrtandra. It is endemic to the island of Hawaii, where it is known only from the slopes of Mauna Kea. As of 1996 there were only three occurrences containing fewer than 20 individuals total. It was federally listed as an endangered species in 1994. Like other Hawaiian Cyrtandra it is called ha`iwale. This plant is a white-flowered shrub growing 1 to 2 meters tall. Its habitat is threatened by feral pigs and exotic plant species such as Koster's curse (Clidemia hirta).

Cyrtandra giffardii is a rare species of flowering plant in the African violet family known by the common names forest cyrtandra and Giffard's cyrtandra. It is endemic to the island of Hawaii, where it grows on the slopes of Mauna Kea and Mauna Loa. A 1998 estimate places the total remaining population size around 1000 individual plants. It is a tree which grows 2 to 6 metres (6 ft 7 in to 19 ft 8 in) tall and bears white flowers. It was federally listed as an endangered species in 1994. Like other Hawaiian Cyrtandra it is called ha`iwale. The plant grows in the wet forests of the two

Cyanea truncata is a rare species of flowering plant in the bellflower family known by the common name Punaluu cyanea. It is endemic to the islands of Oahu and Molokai in Hawaii, but it is now critically endangered. It exists in cultivation and some individuals have been planted in appropriate habitat. It is a federally listed endangered species of the United States. Like other Cyanea it is known as haha in Hawaiian. By the 1980s this Hawaiian lobelioid was known only from the Koʻolau Mountains of Oahu, and the last plants were seen in 1983. No more were found until 1998 when one plant was

Cyanea stictophylla is a rare species of flowering plant in the bellflower family known by the common name Kaiholena cyanea. It is endemic to the island of Hawaii, where it is known only from the rainforests of Mauna Loa. It is a federally listed endangered species of the United States. Like other Cyanea it is known as haha in Hawaiian. This Hawaiian lobelioid is a shrub or tree of the rainforest. It has become rare due to the grazing and trampling damage of cattle. There are perhaps 20 individuals remaining.

Cyanea shipmanii is a rare species of flowering plant in the bellflower family known by the common name Shipman's cyanea. It is endemic to the island of Hawaii, where it is known only from the windward slopes of Mauna Loa and Mauna Kea. It is a federally listed endangered species of the United States. Like other Cyanea, it is known as haha in Hawaiian. New populations of this species, usually consisting of only a handful of individuals each, are still rarely found in the wild at widely scattered locations in windward native forests, at around 5000–6000 feet elevation. There has been

Cyanea rivularis (syn. Delissea rivularis) is a rare species of flowering plant in the bellflower family known by the common name plateau cyanea. It is endemic to Hawaii, where it is known only from the island of Kauaʻi. There are three small populations of the plant remaining in the wild, for a total of 19 individual plants. The plant was federally listed as an endangered species of the United States in 1996. This Hawaiian lobelioid is a shrub growing 4 to 5 meters tall. It bears blue-striped white flowers. It grows in wet forest habitat, generally next to streams, waterfalls, and plunge

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. This plant was very poorly known before 1987, with only two specimens ever having been collected, and no more occurrences of the plant seen since 1916. Then, in 1987, the species was rediscovered when a population of up to 50 plants was found next to the Wailua River. This population was

Cyanea marksii, or Marks' cyanea, is a tree in the bellflower family. It is critically endangered or extinct. The last certain sighting of the species was in 1970.

Cyanea hamatiflora is a rare species of flowering plant in the bellflower family known by the common name wetforest cyanea. It is endemic to Hawaii, where it is known from the islands of Maui and Hawaii, and there are probably fewer than 250 plants remaining in total. It is a federally listed endangered species. Like other Cyanea it is known as haha in Hawaiian. There are two subspecies of this species. The more abundant, ssp. hamatiflora, is native to Maui, where there are no more than 250 individuals left and the population is dropping by at least 25% per generation. The rare ssp. carlsonii

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Wikstroemia oahuensis, the ʻĀkia or Oʻahu false ohelo, is a species of flowering shrub in the mezereon family, Thymelaeaceae, that is endemic to Hawaiʻi.

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Pritchardia beccariana, the Kilauea pritchardia, or Beccari's loulu, is a species of palm tree in the genus Pritchardia that is endemic to wet forests on the eastern part of the island of Hawaiʻi, near Hilo.

Pittosporum hosmeri, also referred to as Kona cheesewood, ʻaʻawa, or ʻaʻawa hua kukui, is a cheesewood endemic to the island of Hawai'i. It is a species of tree in the Pittosporaceae family. This species is listed as endangered and are endemic to the islands. Like other members of the genus native to Hawai'i, it is also referred to as Hō'awa or Hāʻawa in the Hawaiian language.