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Home > Plants
> Endangered Hawaiian Plants
Updated 9/1/2023
Endangered Hawaiian
Plants
Approximately 1000 species of flowering plants
are native to the Hawaiian Islands, 89% of which are endemic to the
region. Many of Hawaii's endemic plants have been driven to
extinction due to a number of human-induced forces including
deforestation, urbanization, agriculture, ranching, over-harvesting,
alien species, and disease. Some may have been common at one time
or limited to a few individuals. Presumably a few had already been
driven to extinction before Western contact. Efforts to protect
these remnants include the Endangered Species
Act, creation of National
Wildlife Refuges, State
Natural
Area Reserves, private preserves (TNC), fencing to exclude mammals,
invasive species control. Propagation efforts by botanical
gardens, nurseries & private citizens allow many of these rarities to survive and be appreciated. |
Family Fabaceae
Sesbania tomentosa
Kaena Point, Oahu
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'OHAI
Endangered shrub formerly common on coastal dunes, and rocky
outcrops. Has silvery leaves coated with dense hairs to reflect
sunlight. Flower color varies by population. Morphology ranges from typically short spreading coastal
form to a tall upland form. Endemic to Hawaii. |
Sesbania tomentosa f.
arborea
'OHAI
Endangered shrub from southern slopes of East Moloka'i. Slender
ascending habit, leaflets smaller, narrower, and less hairy at maturity
than the coastal form. Endemic to Hawaii. |
Acacia koaia
Ho'omaluhia, Kaneohe, Oahu
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KOAI'A
Rare endangered tree of dry forests of Hawaii, Maui, Lana'i, &
Moloka'i. Distinguished from Acacia koa by its small
contorted form, shorter, straighter phyllodes, smaller pods, and
extremely hard wood. |
Caesalpinia kavaiensis
Kapi'olani Garden, Oahu
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'UHI'UHI
Critically endangered tree from mesic or dry forest, probably
widespread long ago but now limited to wild populations on leeward Oahu
and the Big Island. Easily identified by the flattened oval pods and
salmon flowers. Formerly known as Mezoneuron kavaiense.
http://www.nativehawaiiangarden.org/flowering-plants/uhiuhi |
Family
Asteraceae
Argyroxiphium sandwicense
subsp.
sandwicense
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Mauna Kea State Park, Hawaii |
MAUNA KEA SILVERSWORD 'AHINAHINA
Argyroxiphium sandwicense
subsp. macrocephalum
Haleakala, Maui
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HALEAKALA SILVERSWORD 'AHINAHINA
Extremely rare in a single location on the upper slope of Mauna Kea.
Narrow leaves' silver hairs reflect UV radiation and gel-filled core
stores moisture. Blooms once then dies. Threatened with extinction due
to grazing, habitat alteration, trampling of delicate root system, and
loss of natural pollinators. The more common
Haleakala Silversword
occurs on Maui. Flowers in each subspecies differ substantially. |
Bidens amplectens
Kealia, O'ahu |
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LARGE KO'OKO'OLAU
Small endangered shrub restricted to windward cliffs of O'ahu's northern Wai'anae Mountains.
Large flowers exceeding 3 inches in diameter. Hybridizes with
Bidens torta on leeward slopes. |
Tetramolopium filiforme
var. filiforme
Hui Ku Maoli Ola Nursery, Oahu |
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OAHU PAMAKANI
Dwarf shrub uncommon on dry windswept cliffs and slopes of the
Northern Waianae Mountains. Variety filiforme has leaves with smooth
margins and variety polyphyllum has dentate margins. The species is
endangered due to high fire risk and grazing. |
Family Gentianaceae
Schenkia sebaeoides
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SE Oahu |
'AWIWI
Endangered annual herb of dry coastal and lowland slopes from Kaua'i
to West Maui. Plants appear briefly after heavy winter rain.
Formerly known as Centaurium sebaeoides. |
Family Goodeniaceae
Scaevola coriacea
Waiehu dunes, Maui
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DWARF NAUPAKA
Prostrate perennial of consolidated coastal dunes. Succulent
leaves 1 - 2 inches long. Formerly found on the main islands but
nearly extinct due to habitat alteration or loss. Federally
Endangered. |
Family Rubiaceae
Gardenia brighamii
Koko Crater BG, Oahu
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NANU or NA'U
Small endangered tree from dry forests of Oahu to Hawaii. Flower
about 2 inches in diameter. Only a
few wild plants remaining but widely cultivated. |
Family Malvaceae
Hibiscus arnottianus subsp.
immaculatus
MOLOKA'I WHITE HIBISCUS KOKI'O KE'OKE'O
Endangered and
native to Moloka'i's Wailau Valley. Has a white staminal column and
shiny, toothed leaves. |
Hibiscus waimeae subsp.
hannerae
Kalopa Park, Hawaii |
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DWARF WHITE HIBISCUS KOKI'O KE'OKE'O
Rare and endangered in windward mesic forests of North Kaua'i. Compared to
Hibiscus waimeae from
leeward Kaua'i it has larger leaves but smaller flowers with petals 2.5
inches long. |
Hibiscus clayi
Koko Crater, Oahu |
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KOKI'O 'ULA
Rare endangered shrub or small tree from dry forests of
eastern Kaua'i. Flowers & leaves smaller than H. kokio.
Acuminate leaves usually have smooth margins. Formerly known
as H. newhousei. |
Hibiscus brackenridgei subsp.
brackenridgei
Kapi'olani Flower Garden, Oahu
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MA'O HAU HELE
Endangered shrub or small tree from dry forests of Moloka'i, Lana'i,
Maui, & Hawaii. Young stems, calices, & leaf undersides covered
with short velvety hairs, flower buds lack reddish brown spots. |
Hibiscus brackenridgei subsp.
mokuleianus
Cultivated, Waimanalo, Oahu
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MA'O HAU HELE
Endangered shrub or small tree from dry forests of Kaua'i & Oahu.
Young stems & calyx covered with sharp, stinging hairs, leaves somewhat
shiny, flower buds with reddish brown spots. |
Abutilon eremitopetalum
Lana'i Culture & Heritage Center |
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HIDDEN-PETALED ABUTILON
Extremely rare shrub of dry forest now known from a single location on Lana'i. Unique green flowers with petals that remain hidden. Endemic to
Hawaii.
More info (PDF) |
Abutilon menziesii
Koko Crater BG, Oahu |
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RED 'ILIMA KO'OLOA 'ULA
Small clump-forming shrub rare and endangered in dry forest of the Main Hawaiian Islands. An attractive plant widely
maintained in cultivation. Pale to deep red flowers 1.5 inch in
diameter. Endemic to
Hawaii.
http://ntbg.org/plants/plant_details.php?plantid=23 |
Kokia drynarioides
UH Manoa, Oahu |
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HAWAII TREE COTTON HAU HELE 'ULA
Endangered shrub or small tree of dry forests of North Kona.
Large red flowers have twisted petals, leaves with red veins. One of
three endangered and one extinct species. |
Hibiscadelphus giffardianus
Kipukapuaulu, Hawaii |
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KILAUEA HAU KUAHIWI
Rare and endangered shrub known from only one wild specimen at
Kipukapuaulu, Mauna Loa, Hawaii. Now cultivated
in gardens. |
Family
Campanulaceae
Brighamia insignis
Kapi'olani Flower Garden, Oahu
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ALULA
Endangered succulent subshrub of Kaua'i's arid Na Pali cliffs, where a single wild plant remains. Fortunately it has been propagated and distributed among botanical gardens. Showy yellow flowers are now pollinated by hand since its natural moth host is presumed extinct. The white-flowered
Brighamia
rockii occurs on windward cliffs of Moloka'i & Maui.
http://ntbg.org/plants/plant_details.php?plantid=1923 |
Brighamia rockii
Hui Ku Maoli Ola, Oahu
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PUA 'ALA
Endangered succulent plant inhabiting windward sea cliffs of Moloka'i
& Maui. Only a handful of wild plants exist. Flowers are white. Kaua'i's
Brighamia
insignis has yellow flowers. |
Cyanea grimesiana subsp.
obatae
Palikea, O'ahu
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HAHA
Endangered palmate shrub in mesic forest of the Southern Wai'anae
Mountains. Spiny, with purple and white flowers. Subspecies
grimesiana occurs in the Northern Wai'anae Mountains east to
Maui, differing in shape and size of calyx lobes. |
Family Euphorbiaceae
Euphorbia celastroides var.
kaenana
Ka'ena Point, Oahu
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'AKOKO
Endangered shrub restricted to talus slopes at Ka'ena Point on Oahu. |
Euphorbia celastroides var.
laehiensis
Waiopae, Maui
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EAST MAUI 'AKOKO
Endangered sprawling shrub on talus slopes of SE Maui & Lana'i. |
Euphorbia deppeana
Nu'uanu Pali, Oahu
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'AKOKO
Very rare sub shrub on windswept cliffs at Oahu's Nu'uanu Pali Lookout.
Thought to be extinct until its rediscovery in 1986. Leaves lack
hairs, with rounded apex & finely serrate margins. Flowers 1.5
- 3mm wide, nearly sessile in leaf axil. |
Family Amaranthaceae
Achyranthes splendens var.
rotundata
Ka'ena Point NAR, Oahu
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ACHYRANTHES
Rare coastal shrub on dry rocky slopes & coral plains. An
endangered species occurring from Oahu to Maui. |
Nototrichium humile
Kapi'olani Garden, Oahu |
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KULU'I
Endangered shrub in dry forests, slopes, & cliffs of NW Oahu &
East Maui. |
Nototrichium
divaricatum
Kapi'olani Garden, Oahu |
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KULU'I
Endangered shrub from cliffs along Kaua'i's Na Pali coast.
First discovered in 1985. |
Family Rutaceae
Platydesma cornuta var.
decurrens
Palikea, O'ahu |
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WAI'ANAE PILO KEA
Endangered shrub of mesic forest or dry cliffs of O'ahu Wai'anae
Mountains. Palm-like with long leaves clustered at branch ends, this
variety has leaf bases tapering gradually to the petiole. About 300
wild plants are known. Variety cornuta from the Ko'olau
Mountains has leaf bases abruptly truncate where it joins the petiole. |
Family Violaceae
Viola
chamissoniana subsp.
chamissoniana
Palikea, O'ahu
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PAMAKANI
Endangered subshrub on dry ridges of O'ahu's southern Wai'anae
mountains. Leaves thick and glossy with petioles less than an inch
long, pale yellow flowers on peduncles less than an inch long. The parent species occurs from Kaua'i to Maui.
Endemic to Hawa'i. |
Family Araliaceae
Polyscias racemosa
Kapi'olani Garden, Oahu
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MUNROIDENDRON
Endangered tree of mesic forest slopes on Kaua'i. Attains
height of 25 feet. The unique pendant inflorescence led Sherff to create
the monospecific genus Munroidendron. It was reassigned to
Polyscias in 2010.
http://en.wikipedia.org/wiki/Polyscias_racemosa |
Family
Rhamnaceae
Colubrina oppositifolia
Koko Crater BG, Oahu
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KAUILA or KAUWILA
Rare endangered tree of dry & mesic forests of West Oahu &
Hawaii. Prominent glands on underside of leaves. Extremely
hard wood was used in place of metal by Hawaiians. The name Kauila
is also used for Alphitonia ponderosa, another member of this
family endemic to Hawaii. |
Family
Santalaceae
Exocarpos gaudichaudii
Palikea, O'ahu |
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HULUMOA
Rare, almost leafless shrub or small tree of exposed cliffs in mesic
forests of the Main Hawaiian Islands. Fruit beaked, with a red
receptacle. Endemic to Hawai'i. |
Family
Arecaceae
Pritchardia remota
Kapi'olani Garden, Oahu |
Koko Crater, Oahu |
NIHOA FAN PALM
Family Portulacaceae
Portulaca molokiniensis
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UH Manoa Campus |
MOLOKINI PORTULACA 'IHI
Rare from Molokini & two locations on Kaho'olawe. Endemic to
Hawaii. |
Portulaca villosa
HAIRY PURSLANE
'IHI
Portulaca sclerocarpa
KILAUEA PORTULACA 'IHI MAKOLE, PO'E
Family
Caryophyllaceae
Schiedea adamantis
Koko Crater BG, Oahu
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LE'AHI SCHIEDEA
Schiedea kealiae
Kealia, Oahu
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KEALIA SCHIEDEA
Lax subshrub rare and endangered along dry cliffs of the Northern
Wai'anae Mountains. Fewer than 300 plants are known. |
Family
Marsileaceae
Marsilea villosa
Kapi'olani BG, O'ahu
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'IHI'IHI
Endangered species from arid scattered locations on Moloka'i and SE
Oahu. An ephemeral fern that briefly comes to life in waterlogged
ground after soaking rains. Spores are set as fronds wither and dry
until the next wet season. Fortunately the plant is easy to grow and
propagate. |
Family Solanaceae Solanum nelsonii
Kapi'olani BG, O'ahu |
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NELSON'S SOLANUM POPOLO
Sprawling endangered subshrub of coastal dunes primarily in the
Northwestern Hawaiian Islands. Leathery leaves are densely coated
with short hairs. |
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