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Tropical & Subtropical Moist Broadleaf Forests

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Society Islands tropical moist forests

Biome

Tropical & Subtropical Moist Broadleaf Forests

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Biogeographic realm

Oceania

Ferns and an orange-flowered shrub before cloud-draped ridges on Mont Aorai, Tahiti.

Region photo - Wikimedia Commons / Wikimedia Commons - CC BY-SA 3.0; attribution required.

Society Islands tropical moist forests

The Society Islands tropical moist forests cover the Society Islands of French Polynesia in the South Pacific, a chain that includes the high volcanic islands of Tahiti, Moorea, Bora-Bora, Huahine, and Raiatea alongside lower coral islands. Vegetation grades with elevation from lowland rain forest, with native trees such as Inocarpus fagifer, Cananga odorata, and Hibiscus tiliaceus and the bamboo Schizostachyum glaucifolium, up through montane rain forest dominated by Alphitonia zizyphoides, Metrosideros collina, and Hernandia moerenhoutiana, into cloud forest with Alstonia costata and tree ferns at the highest, mist-bathed summits. The climate is humid and tropical, with warm rainy summers and a cooler, drier season, and rainfall increasing sharply on windward mountain slopes. The islands' great age and isolation produced hundreds of endemic plants and animals, including 53 Partula land snail species descended from a single colonization and the endemic Tahiti monarch; only about 30 percent of natural vegetation remains relatively intact, with the invasive tree Miconia calvescens among the gravest threats. Gardeners may recognize ylang-ylang (Cananga odorata) and beach hibiscus (Hibiscus tiliaceus), both native here, as familiar tropical ornamentals.

RESOLVE 630

Oceania

628 sq mi

Tropical & Subtropical Moist Broadleaf Forests

Landscape type

Tropical & Subtropical Moist Broadleaf Forests

Plant region

Oceania

Region footprint

628 sq mi

Habitat pressure

Nature Could Reach Half Protected (Dinerstein NNH 2)

Source & care

Plants that can handle this region

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Similar planting regions

Browse other regions in the same biome. Their plant lists can suggest species and combinations worth comparing.

Mangrove fringe on a tidal flat below forested mountains on Kosrae, Micronesia.

RESOLVE 618 - Oceania

Carolines tropical moist forests

The Carolines tropical moist forests cover the central and eastern Caroline Islands of the Federated States of Micronesia, spanning the high volcanic islands of Chuuk, Pohnpei, and Kosrae together with their surrounding atolls. Originally clothed mostly in tropical rainforest, with mangroves along the shore, the islands grade from lowland forest up through montane forest to summit cloud forest, supporting tree and shrub genera such as Syzygium, Glochidion, Myrsine, Elaeocarpus, and Psychotria alongside Cyathea tree ferns, Pandanus, and native palms. The climate is humid and tropical with little seasonal temperature variation and very heavy rainfall that rises toward the east, where Pohnpei averages more than 4,500 mm a year and parts of Kosrae exceed 6,400 mm. Remarkably, cloud forest forms here at only about 300 to 450 meters elevation, among the lowest-elevation tropical cloud forests in the world, and thirteen bird species are endemic to the ecoregion, including the flagship Pohnpei lorikeet. For gardeners, the region is the native home of ornamental tropicals including Pandanus screwpines, Cyathea tree ferns, and palms in genera such as Clinostigma and Ptychosperma.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 619 - Oceania

Central Polynesian tropical moist forests

The Central Polynesian tropical moist forests stretch across the scattered low islands of the central Pacific, spanning the northern Cook Islands, the Line Islands of Kiribati, and the United States possessions of Johnston Atoll, Jarvis Island, Palmyra Atoll, and Kingman Reef. Almost all of these are coral atolls with open or closed lagoons or raised reef platforms, most lying only a few meters above sea level, so their coastal forests are dominated by salt- and wind-tolerant Indo-Pacific trees such as Pisonia grandis, Calophyllum inophyllum, Pandanus tectorius, Cordia subcordata, and Guettarda speciosa, over an understory of Scaevola taccada, Morinda citrifolia, and Pemphis acidula. The climate is uniformly warm and tropical but ranges from continually wet to drought-prone depending on each island's position relative to the equator and the trade-wind belt. With no native non-marine mammals or amphibians, the ecoregion's wildlife centers on seabirds and endemic land birds like the bokikokiko reed warbler, and several islands hold notable populations of the coconut crab. For gardeners in warm coastal climates, native genera here, including Pandanus, Scaevola, Cordia, and Calophyllum, are familiar salt-tolerant ornamentals.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 620 - Oceania

Cook Islands tropical moist forests

The Cook Islands tropical moist forests cover the Southern Cook Islands, a chain of extinct volcanic and raised-limestone islands in the South Pacific that includes Rarotonga, Aitutaki, Atiu, Mangaia, Mauke, Mitiaro, Manuae, Palmerston, and Takutea. Vegetation grades by elevation from lowland Homalium and Fagraea-Fitchia forest into low-stature Metrosideros cloud forest above about 400 metres on Rarotonga's steep slopes, while the surrounding makatea limestone belts carry Elaeocarpus, Hernandia, and Pandanus. The climate is humid and tropical, shaped by the southeast trade winds, with windward sides wetter than leeward ones and peak rainfall around November and December. Though small, the archipelago is rich in endemics: the blue lorikeet is the flagship species, and six landbirds are strictly endemic, among them the Rarotonga monarch and Mangaia kingfisher, with the Pacific flying fox the only native non-marine mammal. The ecoregion is considered critically endangered, with only a small fraction protected, chiefly Rarotonga's Te Manga cloud forest, and native plants and snails remain pressured by introduced species. Gardeners may recognize native genera such as the screwpine Pandanus and the ornamental Scaevola and Heliotropium of the coastal flora.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 621 - Oceania

Eastern Micronesia tropical moist forests

The Eastern Micronesia tropical moist forests stretch across the low coral islands of the central Pacific, spanning the Marshall Islands and the Gilbert Islands and Banaba of Kiribati, plus the single-island outliers of Nauru and Wake Island. Most of these landmasses are atolls of coralline sand encircling a lagoon, or raised platforms of coralline limestone, with the wetter islands carrying tropical moist forest. Characteristic trees and shrubs include Pisonia grandis, which can tower to around thirty meters and shelter seabird rookeries, alongside Pandanus tectorius, Guettarda speciosa, Cordia subcordata, Scaevola, and Calophyllum inophyllum. The climate is tropical with little seasonal temperature change; islands in the trade-wind belt receive the heaviest rainfall while the northern Marshalls, Wake, and southern Gilberts stay drier. The ecoregion's flagship is the coconut crab, the world's largest land-living arthropod, and it harbors endemics such as the Nauru reed-warbler, though it is highly threatened by invasive species and rising seas. For coastal or tropical gardeners, several of its natives, including Cordia subcordata, screw pine (Pandanus tectorius), and Calophyllum inophyllum, are familiar ornamental and shade plantings.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 622 - Oceania

Fiji tropical moist forests

The Fiji tropical moist forests cover the wetter windward sides of Viti Levu and Vanua Levu, Fiji's two largest islands, along with the smaller Fijian islands and the three islands of Wallis and Futuna, a French overseas territory in the South Pacific. Across an elevational gradient the ecoregion grades from lowland rainforest into montane forest and, on the higher ridges, cloud forest, with characteristic trees including Degeneria, the southern conifers Agathis and Podocarpus, Pandanus, Calophyllum, and Metrosideros, plus tree ferns such as Cyathea. The climate is warm and consistently wet, with most areas receiving over 2,500 mm of rain a year and the windward mountains far more. The forests are exceptionally rich in endemics, harboring the primitive flowering-plant family Degeneriaceae found nowhere else and many island-restricted species, yet they are considered critically endangered with only a small fraction held in formal protected areas.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 623 - Oceania

Hawai'i tropical moist forests

The Hawai'i tropical moist forests blanket the windward lowlands and montane slopes of the Hawaiian archipelago in the Pacific. The ecoregion is a mosaic of coastal and mixed mesic forests, montane rainforests, wet shrublands, and bogs, with 'ohi'a lehua (Metrosideros polymorpha) and koa (Acacia koa) forming the dominant canopy alongside genera such as Cheirodendron, Melicope, Myrsine, and Syzygium. Its climate is shaped by moisture-laden trade winds off the windward slopes, and it harbors one of the world's wettest places on the slopes of Mount Waiʻaleʻale on Kauaʻi, which averages roughly 9,500 mm of rain a year. Tens of millions of years of oceanic isolation have driven extraordinary endemism here, from fungi and land snails to the spectacular radiation of Hawaiian honeycreepers, and the forest's flagship is the scarlet I'iwi. That heritage is now imperiled: of more than 110 native bird species the forests once held, only 48 remain, and the ecoregion is considered critically endangered. Native ornamentals from these forests include the loulu fan palms (Pritchardia) and hala (Pandanus tectorius).

Tropical & Subtropical Moist Broadleaf Forests

Where this ecoregion reaches

The countries, US states, and Canadian provinces this ecoregion touches, from a spatial join of its RESOLVE polygon against Natural Earth boundaries.

Countries

French Polynesia

Educator packet

Region packet

Society Islands tropical moist forests educator packet

The Society Islands tropical moist forests cover the Society Islands of French Polynesia in the South Pacific, a chain that includes the high volcanic islands of Tahiti, Moorea, Bora-Bora, Huahine, and Raiatea alongside lower coral islands. Vegetation grades with elevation from lowland rain forest, with native trees such as Inocarpus fagifer, Cananga odorata, and Hibiscus tiliaceus and the bamboo Schizostachyum glaucifolium, up through montane rain forest dominated by Alphitonia zizyphoides, Metrosideros collina, and Hernandia moerenhoutiana, into cloud forest with Alstonia costata and tree ferns at the highest, mist-bathed summits. The climate is humid and tropical, with warm rainy summers and a cooler, drier season, and rainfall increasing sharply on windward mountain slopes. The islands' great age and isolation produced hundreds of endemic plants and animals, including 53 Partula land snail species descended from a single colonization and the endemic Tahiti monarch; only about 30 percent of natural vegetation remains relatively intact, with the invasive tree Miconia calvescens among the gravest threats. Gardeners may recognize ylang-ylang (Cananga odorata) and beach hibiscus (Hibiscus tiliaceus), both native here, as familiar tropical ornamentals.

Realm

Oceania

Dominant biome

Tropical & Subtropical Moist Broadleaf Forests

Approximate area

628 square miles

States / provinces

Not recorded

Climate descriptor

Not recorded

Classroom prompts

- Which climate and biome facts explain why this region supports its characteristic plants?

- How do native-plant and wildlife-support claims differ from a species-presence claim?

- Which source-backed facts would you cite before using this region in a classroom map activity?

Use the Sources & citations section below for page citation styles and region source links.

Sources & citations

Cite this page

For lesson plans, articles, or regional planting notes that use this Plotwright page. To cite the underlying ecoregion framework or a specific editorial profile, use the source cards below.

Plotwright. (n.d.). Society Islands tropical moist forests (Society Islands tropical moist forests). Retrieved 2026, August 20, from https://plotwright.com/regions/resolve-630

Sources for this region

This page cites Plotwright first for the compiled view, then lists the upstream framework, climate, and editorial source pages so readers can cite the original material directly.

RESOLVE 2017 Terrestrial Ecoregions (Dinerstein et al.)

Primary ecoregion framework

One Earth

Wikipedia

Wikimedia Foundation

Open source

Source guide