Abutilon menziesii, known as Koʻoloaʻula in Hawaiian, is an endangered species of flowering shrub in the mallow family, Malvaceae, that is endemic to Hawaii. It is a sprawling shrub that can reach up to 10 feet in height. The leaves, which range from an inch in width to about five inches, vary in their shapes. They have a velvety feel to them. The small hibiscus-shaped flowers generally hang downward. Though charming up close, the flowers can be hidden by the much larger leaves and not often visible at a distance. Although the Hawaiian name ʻula refers to the more commonly seen red color, koʻoloa ʻula flowers are known in a range of colors: pink, pink and white, pale red, maroon, deep purplish-red (wine), salmon, and blond or butter. The center or staminal column is yellowish.
The poʻo-uli, or black-faced honeycreeper, is an extinct species of passerine bird that was endemic to the island of Maui in Hawaiʻi. It is considered to be a member of the Hawaiian honeycreepers, and is the only member of its genus Melamprosops. It had a black head, brown upper parts and pale gray underparts. This bird inhabited only the wetter, easternmost side of Maui, where it had rapidly decreased in numbers. With extinction threatening, efforts were made to capture birds to enable them to breed in captivity. These efforts were unsuccessful; in 2004, only two known birds remained, and since then, no further birds have been sighted. A 2018 study recommended declaring the species extinct, citing bird population decline patterns and the lack of any confirmed sightings since 2004, and in 2019, the species was declared extinct.
Argyroxiphium sandwicense, the Hawaiʻi silversword, or hinahina is a species of silversword. It is endemic to Hawaii. The two subspecies are separated by geography. Both subspecies are rare, threatened and federally protected.
Gouania hillebrandii, also known as hairyfruit chewstick, is an endangered species of Gouania that is endemic to Hawaii. It formerly could be found on Maui, Molokaʻi, Lānaʻi and Kahoʻolawe, but is today restricted to western Maui near Lahaina. It inhabits dry forests at elevations of 244–518 m (801–1,699 ft). Hairyfruit chewstick is a single branched shrub with small, white flowers.
Calamagrostis expansa is a species of grass in the family Poaceae known by the common name Maui reedgrass. It is native to Hawaii, where it is known only from Maui and the island of Hawaiʻi. Its natural habitats are lowland moist forests and swamps. It is threatened by habitat loss.
Cenchrus agrimonioides is a rare species of grass in the family Poaceae that is endemic to the Hawaiian Islands. Its common names include Kāmanomano and agrimony sandbur. It was formerly distributed throughout the major islands but today it is nearly limited to Oʻahu. Kāmanomano inhabits dry to moist forests and lava plains. It is threatened by competition with non-native plants, predation by ungulates, and wildfire. When this plant became a federally listed endangered species of the United States in 1996 there were fewer than 100 individuals remaining. More recent counts revealed 181 wild individuals on Oʻahu and over 300 more which have been planted to augment the populations. This plant is nearly restricted to the island of Oʻahu, but there are a few individuals known on Maui. A few patches of the grass have been planted on Kahoʻolawe, as well.
Alectryon macrococcus, known as ʻAlaʻalahua or Māhoe in Hawaiian, is a species of flowering tree in the soapberry family, Sapindaceae, that is endemic to Hawaii.
Brighamia rockii, known as the Molokai ohaha or Pua ʻala in Hawaiian, is a species of flowering plant in the bellflower family, Campanulaceae, that is endemic to the island of Molokaʻi in Hawaii. Pua ʻala inhabits mesic shrublands and forests on rocky cliffs from sea level to 470 m (1,540 ft) on the island's northern windward coast. Associated plants include ʻōhiʻa lehua, alaheʻe, lama, ʻūlei, and naupaka.
Melicope mucronulata is a species of plant in the family Rutaceae. It is endemic to the Hawaiian Islands. It is threatened by habitat loss. It is a federally listed endangered species of the United States. Like other Hawaiian Melicope, this species is known as alani.
Melicope ovalis, the wild pelea or Hana melicope, is a species of tree in the family Rutaceae. It is endemic to Maui, of the Hawaiian Islands.
Schiedea adamantis, commonly known as Diamond Head schiedea, is a species of flowering plant in the family Caryophyllaceae, that is endemic to the island of Oʻahu in Hawaii. It inhabits low shrublands on steep slopes along the northwest rim of Diamond Head Crater. Associated plants include nehe, kāwelu, ʻakoko, and ʻilima. There are only about 30 individuals remaining, and they are threatened by habitat loss.
Wikstroemia villosa, the hairy wikstroemia or hairy false ohelo, is a tropical species of plant in the Thymelaeaceae family.
Clermontia oblongifolia is a species of flowering plant in the bellflower family known by the common name Oahu clermontia. It is one of several Hawaiian lobelioids in genus Clermontia that are known as ʻoha wai. This plant is native to three of the Hawaiian Islands, where one subspecies is not uncommon but the other two are very rare and endangered.
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.
Clermontia samuelii is a rare species of flowering plant in the bellflower family known by the common name Hana clermontia. It is one of several Hawaiian lobelioids in genus Clermontia that are known as `oha wai. This plant is endemic to Maui, where there are fewer than 250 mature specimens remaining. This is a federally listed endangered species of the United States.
Cyanea acuminata is a rare species of flowering plant known by the common names Honolulu cyanea. It is endemic to Oahu, where there are no more than 250 individuals remaining. It is a federally listed endangered species of the United States. Like other Cyanea it is known as haha in Hawaiian.
Cyanea copelandii is a rare species of flowering plant in the bellflower family known by the common name treetrunk cyanea. It is endemic to Maui, where there are no more than 250 individuals remaining in the wild. It is a federally listed endangered species of the United States. Like other Cyanea it is known as hāhā in Hawaiian.
Cyanea glabra is a rare species of flowering plant in the bellflower family known by the common name smooth cyanea. It is endemic to Maui, where there are twelve plants remaining in the wild. It was federally listed as an endangered species of the United States with nine other Maui Nui endemics in 1999. Like other Cyanea it is known as haha in Hawaiian.
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.
Coprosma cordicarpa, known as pilo, is a species of plant endemic to the Hawaiian island of Maui. It is locally common in high-elevation dry forests and shrublands of leeward East Maui. It can be distinguished from other Hawaiian Coprosma by its heart-shaped fruit. It is classified as Endangered on the IUCN Red List due to a heavy population decline caused by invasive species.
