A living guide to Kauaʻi
Kauaʻi species, habitats and conservation records
Explore the island’s native and introduced species, habitats, watersheds and conservation work. Each record connects its description, images and sources with the interactive Atlas.
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Psychotria greenwelliae
Psychotria greenwelliae
Psychotria greenwelliae (Psychotria greenwelliae) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Psychotria hexandra
Psychotria hexandra
Psychotria hexandra (Psychotria hexandra) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Psychotria hobdyi
Psychotria hobdyi
Psychotria hobdyi (Psychotria hobdyi) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Kōpiko kea
Psychotria kaduana
Kōpiko kea (Psychotria kaduana) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Forest Wild Coffee
Psychotria mariniana
Forest Wild Coffee (Psychotria mariniana) is endemic to the Hawaiian Islands and recorded on Kauaʻi. Small tree, rarely reaching 20 m, with yellowish- to dark-brown branches.
ʻOpiko
Psychotria mauiensis
ʻOpiko (Psychotria mauiensis) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Psychotria wawrae
Psychotria wawrae
Psychotria wawrae (Psychotria wawrae) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Alaheʻe
Psydrax odorata
Alaheʻe (Psydrax odorata) is a tree; shrub recorded on Kauaʻi. It is indigenous to the Hawaiian Islands.
Pteralyxia kauaiensis
Pteralyxia kauaiensis
Pteralyxia kauaiensis (Pteralyxia kauaiensis) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Round-leaved Bloodwood
Pterocarpus rotundifolius subsp. rotundifolius
Round-leaved Bloodwood (Pterocarpus rotundifolius subsp. rotundifolius) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. Native to s
False Meadow Beauty
Pterolepis glomerata
A small erect subshrub with hairy four-angled young stems and small opposite pointed leaves with three main longitudinal veins. Terminal flower clusters have conspicuously branched or stellate hairs on the floral cups. Large anthers are pin
Macarthur Palm
Ptychosperma propinquum
Macarthur Palm (Ptychosperma propinquum) is a post-contact introduced tree documented on Kauaʻi through cultivation records. Native from western and southern New Guinea to northern Australia in wet tropical forest. Clustering stems and bird
Himalayan Firethorn
Pyracantha crenulata
Himalayan Firethorn (Pyracantha crenulata) is an introduced tree documented on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Its checklist classification is naturalized; current extent is unassessed. Native fr
Taiwan Firethorn
Pyracantha koidzumii
Taiwan Firethorn (Pyracantha koidzumii) is an introduced tree documented on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Its checklist classification is naturalized; current extent is unassessed. Native to Ta
Cork Oak
Quercus suber
Cork Oak (Quercus suber) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. Native to the western Mediterranean region in temperate sc
Hao
Rauvolfia sandwicensis
Hao (Rauvolfia sandwicensis) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Remya kauaiensis
Remya kauaiensis
A weakly erect to climbing native shrub forming tangled clumps. Lanceolate-to-ovate, sharply toothed leaves cluster near shoot tips; their lower surfaces and young growth are white-felted. Open woolly terminal panicles carry tiny heads with
Red mangrove
Rhizophora mangle
Red mangrove (Rhizophora mangle) is native to tropical Atlantic coasts and was intentionally introduced to Hawaiian mudflats in the early twentieth century. It traps sediment and organic matter, converting open mudflat and shallow wetland i
Rose Myrtle
Rhodomyrtus tomentosa
Rose Myrtle (Rhodomyrtus tomentosa) is an introduced tree documented on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Its checklist classification is naturalized; current extent is unassessed. Native to southe
Hawaiian sumac
Rhus sandwicensis
Hawaiian sumac (Rhus sandwicensis) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Beakrush
Rhynchospora rugosa
none_recorded is a sedge in the Kauaʻi vascular and land plants group. Its origin status is indigenous.
Castor bean
Ricinus communis
Castor bean (Ricinus communis) is an introduced tree treated as naturalized on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Current extent is unassessed. A shrub or tree of seasonally dry tropical settings. K
Coral Berry
Rivina humilis
An erect subshrub with thin pointed ovate leaves, often heart-based and long-stalked. Slender racemes carry small pale white-to-pink flowers whose showy parts are sepals. The racemes elongate as small red berries develop; each berry has a h
Kaulu
Rockia sandwicensis
Kaulu (Rockia sandwicensis) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Primavera
Roseodendron donnell-smithii
Primavera (Roseodendron donnell-smithii) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. Native to southern Mexico southward to nor
Cuban Royal Palm
Roystonea regia
Cuban Royal Palm (Roystonea regia) is a post-contact introduced tree documented on Kauaʻi through cultivation records. Native from southern Florida and Mexico through parts of Central America and the Caribbean, primarily in wet tropical set
Prickly Florida Blackberry
Rubus argutus
An erect to arching blackberry shrub with stout cane prickles. Vegetative shoots generally have five sharply toothed leaflets and flowering shoots three. White flowers develop into black aggregate fruits whose receptacle remains attached to
Yellow Himalayan raspberry
Rubus ellipticus
Species identity and image source are documented. Additional ecological and conservation citations are recommended.
ʻĀkala
Rubus hawaiensis
A native raspberry shrub with shredding bark and sparse fine prickles or unarmed canes. Leaves usually have three broad, coarsely toothed leaflets, hairy beneath. Dusky rose to dark-pink flowers develop into large aggregate fruits; a repres
Mysore Raspberry
Rubus niveus
A prickly shrub with hooked cane prickles and pinnate leaves of five to nine toothed leaflets, white-felted beneath. Small rose-purple flowers develop into roughly centimeter-wide aggregate fruits that darken from red to reddish black. Esta
Thimbleberry
Rubus rosifolius
Species identity and image source are documented. Additional ecological and conservation citations are recommended.
Molucca Raspberry
Rubus sieboldii
A robust rhizomatous climbing shrub with stout prickles and large simple, rounded-to-ovate leaves. The blades have five palmate main veins, irregular teeth or shallow lobes, and white-to-yellowish-brown felt beneath. White flowers develop i
Creeping Ruellia
Ruellia longepetiolata
A low erect-to-sprawling perennial with dull-green leaves and purplish stems. A documented Kauaʻi specimen was about thirty centimeters tall, with lilac corollas paler toward their bases. Fruits were not observed on that specimen. Establish
Huʻahuʻakō
Rumex albescens
A decumbent native subshrub with thin narrow delta-shaped to lanceolate, heart-based leaves. Margins are wavy, crisped and finely eroded-toothed. Branched panicles bear numerous tiny green-to-yellow-green flowers. Fruiting valves are yellow
Maʻo hau hele
Sabdariffa brackenridgei
Maʻo hau hele (Sabdariffa brackenridgei) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
ʻAkiohala
Sabdariffa furcellata
A hairy shrub with bristles and stellate hairs. Heart-based serrate leaves vary from narrow to ovate or shallowly three-to-five-lobed. Large pink-lavender flowers have dark-purple basal spots and an epicalyx of ten to twelve narrow bracts w
Sugarcane
Saccharum officinarum
kō is a grass crop in the Kauaʻi vascular and land plants group. Its origin status is polynesian introduction.
Amau fern
Sadleria cyatheoides
ʻamaʻu is a fern in the Kauaʻi vascular and land plants group. Its origin status is endemic.
Monkeypod
Samanea saman
Monkeypod (Samanea saman) is an introduced tree documented on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Its checklist classification is naturalized; current extent is unassessed. Native to tropical America
American Elderberry
Sambucus canadensis
A spreading, multistemmed shrub with opposite pinnate leaves, usually seven sharply serrate pointed leaflets. Broad, flat-topped to rounded clusters carry many small creamy-white flowers. Large drooping clusters of rounded purplish-black dr
Sanchezia
Sanchezia oblonga
A shrub with large glossy pointed oblong-ovate leaves whose sunken veins are outlined white or yellow. Spike-like flower clusters carry yellow tubular flowers and conspicuous bright-red bracts, longer than and largely enclosing the calyx. C
Santol
Sandoricum koetjape
Santol (Sandoricum koetjape) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. A tropical tree associated with primary and secondary
Indian sandalwood
Santalum album
Indian sandalwood (Santalum album) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. Kew currently accepts Santalum album L., native
Coastal sandalwood
Santalum ellipticum
Coastal sandalwood (Santalum ellipticum) is endemic to the Hawaiian Islands and recorded on Kauaʻi. Sprawling shrub or small tree 1–5 m tall.
Santalum involutum
Santalum involutum
Santalum involutum (Santalum involutum) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Kauaʻi sandalwood
Santalum pyrularium
Kauaʻi sandalwood (Santalum pyrularium) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Oʻahu soapberry
Sapindus oahuensis
Oʻahu soapberry (Sapindus oahuensis) is a tree recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Soapberry
Sapindus saponaria
Soapberry (Sapindus saponaria) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. The accepted species occurs broadly in the central P
Limu kala
Sargassum aquifolium
limu kala is a brown alga in the Kauaʻi limu group. Its origin status is indigenous.
Mountain naupaka
Scaevola gaudichaudiana
Mountain naupaka (Scaevola gaudichaudiana) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Naupaka Kuahiwi
Scaevola gaudichaudii
A low native shrub with hairless oblanceolate leaves bearing a few teeth in their upper half. A representative brownish-yellow flower form has slender tubes and spreading lanceolate lobes without winged margins. Small smooth ovoid fruits ri
ʻOhe Naupaka
Scaevola glabra
A native shrub with mature stems largely leafless below the tips. Leathery pointed oblanceolate-to-obovate leaves crowd the shoot ends and have axillary hair tufts. Bright-yellow waxy flowers curve outward; their tubes split along the upper
Naupaka Kuahiwi
Scaevola mollis
A native shrub with narrow lanceolate-to-oblanceolate, minutely toothed leaves, softly gray-hairy beneath. A representative purple-flowered form has hairy tubes and winged lobe margins. Oblong purplish-black fruits are densely hairy. This n
Naupaka kuahiwi
Scaevola procera
Naupaka kuahiwi (Scaevola procera) is a tree; shrub recorded on Kauaʻi. It is endemic to the Hawaiian Islands.
Beach naupaka
Scaevola taccada
naupaka kahakai is a shrub in the Kauaʻi vascular and land plants group. Its origin status is indigenous.
Octopus tree
Heptapleurum actinophyllum
Kew currently accepts Heptapleurum actinophyllum and treats Schefflera actinophylla as a synonym. The Australian-New Guinean ornamental is introduced and naturalized in Hawaiʻi, where bird-dispersed seeds move from landscapes into moist for
Schiedea apokremnos
Schiedea apokremnos
A low ascending-to-decumbent native shrub with opposite slightly succulent, glaucous oblanceolate leaves and smooth margins. Short congested terminal flower systems bear small green-to-purple sepals, with no true petals. Tiny ovoid capsules
Schiedea attenuata
Schiedea attenuata
A sparsely branched erect native shrub with opposite thick glossy narrow curved leaves, rolled margins and long tapered tips. Diffuse, often one-sided terminal flower systems carry pale green-white to yellow-white petaloid sepals, sometimes
Schiedea kauaiensis
Schiedea kauaiensis
none_recorded is a herb shrub in the Kauaʻi vascular and land plants group. Its origin status is endemic.
Schiedea napaliensis
Schiedea napaliensis
An erect, few-branched native shrub with purplish internodes and opposite broad oblong leaves. Yellow-green blades are glossy and rubbery, with smooth slightly wavy margins. Large diffuse terminal flower systems have glandular-hairy green s
