Phyllostegia is a genus of flowering plant in the mint family, Lamiaceae, first described in 1840. It is native to certain islands in the Pacific.
- Phyllostegia ambigua(A.Gray) Hillebr - Hawaii Big Island, Maui
- Phyllostegia bracteataSherff - Maui
- Phyllostegia brevidensA.Gray - Hawaii Big Island, Maui
- Phyllostegia electraC.N.Forbes - Kauai
- Phyllostegia floribundaBenth - Hawaii Big Island
- Phyllostegia glabra (Gaudich.) Benth. - Hawaiian Islands
- Phyllostegia grandiflora(Gaudich.) Benth - Oahu
- Phyllostegia haliakalaeWawra - Maui, Molokai
- Phyllostegia helleriSherff - Wai'alae Valley of Kauai
- †Phyllostegia hillebrandiiH.Mann ex Hillebr - Maui but extinct
- Phyllostegia hirsutaBenth. - Oahu
- Phyllostegia hispidaHillebr. - Molokai
- Phyllostegia kaalaensisH.St.John - Oahu
- Phyllostegia kahiliensisH.St.John - Kauai
- Phyllostegia knudseniiHillebr. - Kauai
- Phyllostegia macrophylla(Gaudich.) Benth. - Hawaii Big Island, Maui
- Phyllostegia manniiSherff - Molokai, Maui
- Phyllostegia micranthaH.St.John - Oahu
- Phyllostegia mollisBenth. - Hawaiian Islands
- Phyllostegia parvifloraBenth. - Hawaiian Islands
- Phyllostegia pilosaH.St.John - Hawaiian Islands
- Phyllostegia racemosaBenth. - Hawaiian Islands
- Phyllostegia renovansW.L.Wagner - Kauai
- †Phyllostegia rockiiSherff - Maui but extinct
- Phyllostegia stachyoidesA.Gray - Hawaiian Islands
- †Phyllostegia tahitensisNadeaud - Tahiti but extinct
- Phyllostegia tongaensisH.St.John - Tonga
- †Phyllostegia variabilisBitter - Midway Islands but extinct
- Phyllostegia velutina(Sherff) H.St.John - Hawaii Big Island
- Phyllostegia vestitaBenth. - Hawaii Big Island
- Phyllostegia waimeaeWawra - Kauai
- Phyllostegia warshaueriH.St.John - Hawaii Big Island
- Phyllostegia wawranaSherff - Kauai
- Phyllostegia × yamaguchiiHosaka & O.Deg. - Oahu (P. glabra × P. hirsuta)
Phyllostegia mollis, the Waianae Range phyllostegia, is a species of flowering plant in the mint family, Lamiaceae, that is endemic to Hawaiʻi. It can be found in mesic and wet forests at elevations of 450–1,830 metres (1,480–6,000 ft) on the islands of Maui and Oʻahu. Some authors consider it to be an Oahu endemic, with the Maui populations belonging to a separate species, Phyllostegia pilosa. By 2003 there were fewer than 40 individuals remaining. It is threatened by habitat loss.
Eugenia koolauensis, commonly known as Koʻolau eugenia or nioi, is a species of flowering plant in the myrtle family, Myrtaceae. It is endemic to Hawaii, where it could previously be found on the islands of Molokaʻi and Oʻahu; today populations only exist on the latter. This is a federally listed endangered species of the United States.
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.
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 viridiflora is a rare species of flowering plant in the African violet family. It is endemic to Hawaii, where it is known only from the northern Koolau Mountains of Oahu. By 2003 there were nine small populations remaining, for a total of 69 plants. It was federally listed as an endangered species in 1996. Like other Hawaiian Cyrtandra it is called ha`iwale.
Melicope lydgatei is a rare species of flowering plant in the citrus family known by the common names Koolau Range melicope and Lydgate's pelea. It is endemic to Hawaii, where it is known only from the Koolau Range on the island of Oahu. It is a federally listed endangered species of the United States. Like other Hawaiian Melicope, this species is known as alani.
Neraudia angulata is a rare species of flowering plant in the nettle family known by the common name angularfruit ma'oloa. It is endemic to Hawaii, where it is known only from the Waianae Range on the island of Oahu. There are nine remaining populations with a varying number of individuals; in 2006 there were 227 mature individuals counted. This is a federally listed endangered species of the United States.
Phyllostegia glabra is a species of flowering plant in the mint family known by the common name ulihi phyllostegia. It is endemic to Hawaii.
Phyllostegia knudsenii is a rare species of flowering plant in the mint family known by the common name Waimea phyllostegia and Knudsen's phyllostegia. 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.
Phyllostegia parviflora is a rare species of flowering plant in the mint family known by the common name smallflower phyllostegia. It is endemic to Hawaii, where it is known from Maui, Oahu, and the island of Hawaii. It is a federally listed endangered species of the United States.
Phyllostegia renovans is a rare species of flowering plant in the mint family known by the common name red-leaf phyllostegia. It is endemic to Hawaii, where it is known only from the island of Kauai. It was federally listed as an endangered species of the United States in 2010.
Phyllostegia waimeae is a rare species of flowering plant in the mint family known by the common name Kauai phyllostegia. It is endemic to Hawaii, where it is limited to the island of Kauai. It is a federally listed endangered species of the United States.
Phyllostegia wawrana is a rare species of flowering plant in the mint family known by the common name fuzzystem phyllostegia. It is endemic to Hawaii, where it is limited to the island of Kauai. It is a federally listed endangered species of the United States.
Plantago princeps is a rare species of flowering plant in the plantain family known by the common name ale. It is endemic to Hawaii, where it is known from the islands of Hawaii, Kauai, Oahu, Molokai, and Maui. Like other Hawaiian Plantago, it is known as kuahiwi laukahi, or laukahi kuahiwi. It is a federally listed endangered species of the United States.
Sanicula mariversa is a rare species of flowering plant in the family Apiaceae known by the common name Waianae Range black-snakeroot. It is endemic to Hawaii, where it is known only from the Waianae Mountains 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.
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.
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.
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.
Vigna owahuensis is a rare species of flowering plant in the legume family known by the common name Oahu cowpea.
