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Tropical & Subtropical Moist Broadleaf Forests

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Cross-Sanaga-Bioko coastal forests

Biome

Tropical & Subtropical Moist Broadleaf Forests

Biogeographic realm

Afrotropic

Suspension footbridge crossing the rapids of the Mana River at the Korup National Park entrance, Cameroon.

Region photo - Christos Astaras / Wikimedia Commons - Attribution; attribution required.

Cross-Sanaga-Bioko coastal forests

The Cross-Sanaga-Bioko coastal forests are a tropical moist broadleaf forest ecoregion of west-central Africa, spanning southeastern Nigeria, southwestern Cameroon, and the lowlands of the island of Bioko in Equatorial Guinea, running from the Cross River south to the Sanaga River and reaching up to 300 km inland from the Atlantic coast. The dominant habitat is coastal evergreen rainforest, grading into mixed moist semi-evergreen forest further inland, with plant families such as Annonaceae, Leguminosae, Euphorbiaceae, Rubiaceae, and Sterculiaceae well represented. This is one of the wettest parts of tropical Africa, with heavy rainfall throughout the year, humidity that rarely drops below 90 percent, and rainfall exceeding 10,000 mm per year in the southwestern foothills of Mount Cameroon while averaging around 3,000 mm along the coast and roughly 2,000 mm inland. The ecoregion is exceptionally rich in endemic plants and supports some of the highest numbers of forest-restricted birds and mammals in Africa, including the Cross River gorilla and Preuss's red colobus, with a 2017 assessment finding that about 26 percent of the region lies within protected areas such as Korup and Cross River National Parks. For gardeners, it is a useful reminder that its native flora is adapted to constant warmth, very high humidity, and abundant year-round rainfall rather than seasonal drought.

RESOLVE 7

Afrotropic

20,101 sq mi

Tropical & Subtropical Moist Broadleaf Forests

Landscape type

Tropical & Subtropical Moist Broadleaf Forests

Plant region

Afrotropic

Region footprint

20,101 sq mi

Habitat pressure

Nature Could Reach Half Protected (Dinerstein NNH 2)

Source & care

Plants that can handle this region

A climate-fit shortlist from Plotwright's catalog. Start with the reliable fits, then use each plant page to check light, water, soil, mature size, and local availability.

Showing 17 of 17 climate-fit plants for this region.

Reliable climate fits

Good bets for now and later

17 plants

These plants fit the region today and stay within range under the mid-century projection. Start here when you want choices with the least climate regret.

Persea americana

Avocado

A frost-tender broadleaf evergreen tree of the laurel family, native to Mexico and Central America and grown across the tropics and subtropics for its buttery, pear-shaped fruit. Glossy dark-green elliptic leaves 4 to 8 inches long clothe a tree that reaches 30 to 60 feet, hung with greenish-yellow flower panicles that give way to large single-seeded berries. Hardy only in USDA zones 10-12 - north of that it is an indoor curiosity easily sprouted from a pit, but one that rarely fruits.

Tree

Full sun / Part shade

Swietenia macrophylla

Bigleaf mahogany

The premier true mahogany and one of the most commercially important tropical hardwoods on Earth: a very large neotropical timber tree that reaches roughly 100 to 150 feet with a broad, spreading, rounded crown, pinnately compound leaves, and reddish-brown heartwood prized for fine furniture and instruments. Honesty first: this is a knowledge and conservation entry, not a plant most people can or should grow. It is a frost-tender tropical giant hardy only in USDA zones 10b-12b, native to the neotropics from southern Mexico through Central America into Amazonian South America, with no role as a temperate-garden ornamental. More important than any landscape use is its conservation status - decades of overharvest for that famous mahogany timber have made it conservation-sensitive, and it is listed on CITES Appendix II, meaning international trade is regulated to keep harvest from driving the species toward extinction. Include it for its story and its scale, and source any wood or plant material only through legal, certified, sustainable channels.

A clumping, multi-stemmed evergreen perennial from South Africa, grown for its unmistakable crane-head flowers - a horizontal green-and-pink spathe from which bright orange sepals and vivid blue petals emerge like the crest of an exotic bird. Bold, paddle-shaped blue-green leaves on long stalks form a 3-4 foot fountain of foliage. Winter hardy only in USDA zones 10-12 (frost-free subtropics); everywhere colder it is grown as a houseplant or summered-out container plant. It blooms reliably only from a well-established, somewhat crowded clump, so patience is the key to flowers.

Perennial

Full sun / Part shade

Broadleaf plantain is the broad-leaved, ground-hugging weed of lawns, paths, driveways, and roadsides across North America - and, honestly, an introduced Eurasian species, not a native. It forms a flat basal rosette of broad, strongly ribbed oval leaves that presses tight to the ground, sending up slender, erect, rat-tail flower spikes through summer. Its tie to human disturbance runs so deep that some Indigenous peoples called it 'white man's footprint,' because it followed colonists wherever soil was trodden bare. Despite the weedy reputation it is genuinely undervalued for habitat: the wind-pollinated spikes are heavy pollen sources, the ripe seed feeds finches and other small birds, and it is a documented larval host for the common buckeye butterfly. The young leaves are edible cooked or in salad, with a long medicinal and poultice history.

Herb

Full sun / Part shade

Cacao is the chocolate tree - a small evergreen understory tree of the lowland tropical rainforest, famous for being cauliflorous: its tiny pink-and-white flowers, and then the large ridged football-shaped pods, are borne directly on the trunk and oldest branches rather than out among the leaves. Reaching roughly 15 to 25 feet, it carries glossy oblong leaves that flush bronze when young. Each pod holds 30-40 seeds embedded in sweet white pulp; those seeds become chocolate only after fermenting, drying, and roasting (the cacau of Brazil). It is genuinely demanding - a true tropical, needing deep humid warmth and overhead shade and failing below about 50°F - so outside the wet tropics it is a greenhouse or conservatory plant only. Its flowers are pollinated not by bees but by tiny midges.

Schlumbergera x buckleyi

Christmas cactus

The true Christmas cactus - the hybrid Schlumbergera x buckleyi - a long-lived epiphytic holiday cactus grown indoors almost everywhere for its arching, segmented stems and its rose-to-magenta flowers that open in mid-winter, around Christmas. It is worth getting the identity right, because most plants sold and labeled as 'Christmas cactus' are actually the Thanksgiving cactus, Schlumbergera truncata. You can tell the two apart by the edges of the flat stem segments and by when they bloom: the true Christmas cactus has rounded, scalloped segment margins and flowers a few weeks later, in mid-winter, while the Thanksgiving cactus has sharp, claw-like teeth and blooms from late fall into early winter. Unlike a desert cactus, this is a forest epiphyte that grows on tree branches in the Atlantic coastal forest of southeastern Brazil, so it wants bright indirect light, a free-draining mix, sparing water, and - to set its buds - cool nights and short days. A reassuring point that sets it apart from many houseplants: it is non-toxic to cats and dogs. One more field mark clinches it: the true Christmas cactus has rose-pink pollen and flowers that hang almost regularly (radially), where the Thanksgiving cactus has yellow pollen and asymmetric blooms held out nearly horizontally.

A warm-season member of the nightshade family (Solanaceae) - a relative of tomato, potato, and pepper - grown for its showy, glossy edible berries that range from white and green through deep purple to nearly black depending on cultivar. The plant is technically a tender herbaceous perennial but is grown as an annual vegetable across most of North America, where it demands a long, hot, frost-free season to fruit well. Drooping violet star-shaped flowers give way to the familiar pendant fruit; the leaves, flowers, stems, and roots are toxic and only the fruit is eaten.

A tropical evergreen tree from the lowland rainforests of western and central Africa, grown almost everywhere else as a dramatic indoor specimen for its huge, glossy, fiddle- (or violin-) shaped leaves with bold sunken veins. In its native habitat it becomes a 40-foot tree, but as a houseplant or patio container plant it is typically kept to a single upright 6-15 foot trunk topped with a sculptural rosette of leaves. Winter-hardy only in the frost-free subtropics (USDA zones 10-12); everywhere colder it is a houseplant. It is famously fussy: it wants bright, steady light, even moisture, warmth, and - above all - to be left in one spot, dropping leaves in protest at cold drafts, moves, or erratic watering.

The true culinary ginger - a tropical-Asian herbaceous perennial grown for its aromatic, pungent, branched rhizome rather than its rarely-seen bloom. Reed-like pseudostems carry two-ranked lanceolate leaves to 2 to 4 feet, rising from a fleshy underground rhizome that is the kitchen and apothecary spice. Hardy outdoors only in USDA zones 9-12; in cooler regions it is grown as a warm-season annual or container plant and started from a fresh grocery-store rhizome each spring.

The classic florists' gloxinia, a tuberous tropical perennial of the Gesneriaceae native to the Atlantic Forest of south-eastern Brazil (POWO, Kew; recorded as Brazilian-native in Flora e Funga do Brasil). It forms a low, neat rosette of soft, velvety leaves above which sit large, showy, bell-shaped flowers in rich violet, red, pink or white, often finished with a contrasting picotee edge. POWO and Flora e Funga do Brasil record Sinningia speciosa as the wild parent of the cultivated florist gloxinia, and that ornamental heritage is exactly how it is grown almost everywhere - as a tender pot or houseplant prized for its plush leaves and velvety trumpet-and-bell flowers. HONESTY: it is very frost-tender, hardy in the ground only in roughly USDA zone 11 and above, and it has a real dormant season - after flowering it dies back to a resting tuber before regrowing, so it is not an evergreen plant but a cyclical one. It is grown purely as an ornamental: no part is eaten. The flowers are insect-pollinated and, in the plant's native Brazilian range, also visited by hummingbirds.

A fast, twining annual vine from tropical America grown for the azure-blue trumpets that open at dawn and fade by afternoon, each marked with a white-to-golden-yellow star throat. Heart-shaped leaves clothe stems that climb 8 to 10 feet in a single season on any support. Showy and easy from seed, but every part - especially the seed - is poisonous if eaten, so site it away from where pets and children graze.

A tender perennial from New Guinea grown almost everywhere in North America as a warm-season annual, prized for non-stop bright bloom in part shade - and, unlike common impatiens, in considerably more sun. It mounds 6 to 24 inches tall and 1.5 to 3 feet wide, carrying large, flat, five-petaled flowers in coral, salmon, pink, red, orange, lavender, and white above bold, often bronze-tinted dark foliage. Its real selling point is honest and practical: Impatiens hawkeri is resistant to impatiens downy mildew (Plasmopara obducens), the disease that collapsed plantings of Impatiens walleriana, making it the dependable shade-to-part-sun bedding plant where the common species can no longer be trusted.

Annual

Full sun / Part shade

Spathiphyllum wallisii

Peace lily

One of the most popular and forgiving foliage houseplants - an evergreen tropical perennial grown indoors for its glossy, dark-green, lance-shaped leaves and elegant white "flowers." Those flowers are not true showy blooms but a white leafy hood, the spathe, wrapped around a creamy spadix. POWO (Kew) places Spathiphyllum wallisii native to the tropical rainforests of Colombia and Venezuela; it is now grown worldwide as an indoor foliage plant. Honesty matters here. It is famously easy: it tolerates LOW light and conveniently droops when thirsty, then recovers after a watering. But every part contains insoluble calcium-oxalate crystals and is TOXIC to cats, dogs, and people if chewed, so keep it away from pets and small children. And its celebrated "air-purifying" reputation, from a 1989 NASA chamber study, is OVERSTATED - at realistic room densities the effect on indoor air quality is negligible. Grow it for its looks and easy care, not as an air purifier. RHS rates it frost-tender, H1B, a tender evergreen for shade and indoor culture under glass.

A bold tropical fig from South and Southeast Asia grown almost everywhere as a houseplant for its large, glossy, leathery, deep-green (or cream- and burgundy-variegated) paddle leaves. Honesty first: in its frost-free native habitat and outdoors in USDA zones 9-12 this is a massive strangler-type fig that can reach 50 to 100 feet with a spreading, aerial-rooting crown - but in the homes, offices, and patio containers where almost everyone grows it, it is kept a fraction of that size by pot confinement and pruning. It is easygoing in bright indirect light and forgiving of average indoor conditions; the one real catch is its milky latex sap, a mild skin, eye, and digestive irritant that also bothers latex-sensitive people. The same latex was historically tapped to make natural rubber, which is where the name comes from.

A large, spreading tropical tree from sub-Saharan Africa, famous for the enormous grey, sausage-shaped fruits that dangle on long cord-like stalks beneath its rounded crown. Honesty first: where it is hardy (USDA zones 10a-12b) it grows into a 30-60 foot evergreen-to-semi-deciduous shade tree, and at night it opens large, maroon, foul-smelling, cup-shaped flowers that are pollinated by bats. The fruits are the headline and the hazard - they can reach about 24 inches long and weigh several pounds, and a falling fruit can genuinely injure a person or dent a car, so it must never be sited over patios, walks, or parking. The raw fruit is toxic and purgative to humans; it is used only after careful processing in traditional medicine and skincare, never eaten raw. It is frost-tender and strictly a warm-climate specimen tree, not a temperate-garden plant.

A bold tropical aroid from the rainforests of southern Mexico through Panama, grown almost everywhere outside the frost-free tropics as a foliage houseplant. It is a climbing epiphyte: it sends adventitious aerial roots to scramble up tree trunks, and its huge glossy heart-shaped leaves develop the deep cuts and oval holes (fenestrations) that give it both common names. Mature plants in the tropics flower with a creamy aroid spathe and produce a cone-like fruit that is edible only when fully ripe. Indoors it rarely flowers and is prized purely for its dramatic, architectural foliage.

Schlumbergera truncata

Thanksgiving cactus

A long-lived epiphytic cactus from the Atlantic coastal forest of southeastern Brazil, grown indoors almost everywhere for its arching, segmented stems and its showy late-fall and winter flowers in hot pink, magenta, red, orange, salmon, or white. It is the plant most often sold and labeled as a 'Christmas cactus,' but the confusion is near-universal and worth getting right: this is the Thanksgiving, crab, or claw cactus, with sharp, claw-like teeth on the edges of its flat stem segments and a bloom season that runs from late fall into winter. The true Christmas cactus is a different plant, the hybrid Schlumbergera x buckleyi, which has smooth, rounded segment margins and blooms a few weeks later. Unlike a true desert cactus, it is a forest epiphyte that grows on tree branches in dappled light, so it wants bright indirect light, a free-draining mix, sparing water, and - to set its buds - cool nights and short days. A reassuring point that sets it apart from many houseplants: it is non-toxic to cats and dogs. The surest field mark is the pollen: Schlumbergera truncata has yellow pollen and asymmetric flowers held out nearly horizontally, where the true Christmas cactus (S. x buckleyi) has rose-pink pollen and more regular, pendent blooms.

Starter kits for this region

Generated from catalog plants that already pass this region's climate fit gate, with native matches sorted first when the catalog has enough coverage.

Sunny pollinator border

A sunny, wildlife-forward planting assembled from plants that pass this region fit gate.

Native fit: 0/6

Climate resilient: 6/6

Wildlife links: 10

Host/specialist links: 1

Forage/pollination links: 10

Shelter links: 0

Avocado - Climate-resilient Bird of paradise - Climate-resilient Broadleaf plantain - Climate-resilient Eggplant - Climate-resilient Morning glory - Climate-resilient New Guinea impatiens - Climate-resilient

Shade-edge planting

A softer edge kit for woodland margins, porches, and mixed-light garden edges.

Native fit: 0/6

Climate resilient: 6/6

Wildlife links: 8

Host/specialist links: 1

Forage/pollination links: 7

Shelter links: 0

Avocado - Climate-resilient Bird of paradise - Climate-resilient Broadleaf plantain - Climate-resilient Cacao - Climate-resilient Christmas cactus - Climate-resilient Fiddle-leaf fig - Climate-resilient

Resilient shrub layer

A woody structure layer led by plants that fit both current and projected regional conditions.

Native fit: 0/6

Climate resilient: 6/6

Wildlife links: 1

Host/specialist links: 0

Forage/pollination links: 1

Shelter links: 0

Avocado - Climate-resilient Bigleaf mahogany - Climate-resilient Cacao - Climate-resilient Fiddle-leaf fig - Climate-resilient Rubber plant - Climate-resilient Sausage tree - Climate-resilient

Similar planting regions

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

Layered forested mountains in Bwindi, Uganda, within the Albertine Rift region.

RESOLVE 1 - Afrotropic

Albertine Rift montane forests

The Albertine Rift montane forests cloak the mountains of the western branch of the East African Rift, spanning five countries: the Democratic Republic of the Congo, Uganda, Rwanda, Burundi, and Tanzania, and taking in ranges such as the Virunga and Rwenzori mountains and isolated massifs near Lake Tanganyika. These tropical moist broadleaf forests are rich in the plant families Euphorbiaceae, Rubiaceae, and Meliaceae, with vegetation shifting by elevation from dense lowland forest through moss- and fern-draped montane forest into giant bamboo and high moorland. Although it sits in the heart of tropical Africa, the high terrain gives the region an essentially temperate climate, with annual rainfall generally between 1,200 and 2,200 millimeters and reaching about 3,000 millimeters on the western slopes of the Rwenzori. The ecoregion holds the highest faunal endemism in Africa and is the only home of the mountain gorilla, earning it a place on the Global 200 list of priority conservation areas, with strongholds protected in parks including Virunga, Volcanoes, Bwindi Impenetrable, Nyungwe, and Kahuzi-Biega. Gardeners may recognize the giant montane bamboo that forms a distinct belt across these slopes.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 2 - Afrotropic

Cameroon Highlands forests

The Cameroon Highlands forests cloak the chain of mountains that runs inland from the Gulf of Guinea and forms much of the border between Cameroon and Nigeria, rising to Mount Oku at 3,011 meters. Above roughly 900 meters the slopes carry a mosaic of submontane and montane forest, montane grassland, and bamboo, with characteristic trees such as Podocarpus latifolius, Prunus africana, Syzygium guineense, Nuxia congesta, and Rapanea (Myrsine) melanophloeos. Although it sits in tropical Africa, the altitude keeps mean maximum temperatures below 20 degrees Celsius, while rainfall ranges from around 4,000 mm a year near the coast to 1,800 mm or less further inland. The forests are exceptionally rich in endemic life, including the endangered Cross River gorilla, the flagship Bamenda apalis, and a large suite of amphibians found nowhere else, though forest cover has declined by more than half since the 1960s through farming, logging, and fire.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 3 - Afrotropic

Central Congolian lowland forests

The Central Congolian lowland forests occupy the heart of the Congo Basin within the Democratic Republic of the Congo, filling the Cuvette Centrale south of the great arc of the Congo River, which acts as a natural barrier isolating the basin along its northern, eastern, and western edges. The terrain is largely flat lowland, and its vegetation forms a mosaic: seasonally inundated and permanent swamp forests in the north give way to drier semi-evergreen rainforest and patches of grassland in the south, with dominant canopy trees including Gilbertiodendron dewevrei and Staudtia stipitata. The climate is hot and humid with little seasonal variation, mean maximum temperatures near 30 degrees Celsius in the central portion easing toward the southeast margins. This remote region holds the world's largest populations of the bonobo, which is endemic to the DRC, alongside African forest elephants, the strictly endemic Dryas monkey, and the near-endemic Congo peafowl. Much of it lies within Salonga National Park, one of the largest tropical-forest national parks in the world.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 4 - Afrotropic

Comoros forests

The Comoros forests ecoregion covers the volcanic islands of the Comoros archipelago in the Mozambique Channel between Madagascar and East Africa, including Grande Comore (Ngazidja), Anjouan (Nzwani) and Mohéli (Mwali) of the Union of the Comoros along with Mayotte, a region of France. Its natural cover is tropical moist broadleaf forest, ranging from semi-deciduous and evergreen lowland forest up to montane forest near the peaks, with characteristic canopy trees such as Ocotea comorensis, Khaya, Olea capensis and Prunus africana, and giant heath (Erica comorensis) at the highest elevations. The climate is wet and tropical, with a hot rainy season and a cooler drier season; rainfall is highly uneven, exceeding 5,000 mm a year on some uplands while the driest coasts receive around 1,000 mm. The islands hold roughly 1,000 native plant species, about 30 percent of them endemic, and shelter the Livingstone's fruit bat (Pteropus livingstonii) as a flagship species, though little intact forest remains and the ecoregion is rated critically endangered. For gardeners in warm, humid climates, native ornamentals from here include tree ferns (Alsophila) and the endemic palm Ravenea hildebrandtii.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 5 - Afrotropic

Congolian coastal forests

The Congolian Coastal Forests (also called the Atlantic Equatorial coastal forests) stretch along Central Africa's Atlantic seaboard from the Sanaga River in Cameroon south through Equatorial Guinea, Gabon, the Republic of the Congo, and Cabinda in Angola to the mouth of the Congo River in the Democratic Republic of the Congo. The dominant cover is coastal evergreen moist broadleaf forest, grading into mixed semi-evergreen forest in the drier south, with coastal grassland and montane forest above 1,000 meters on ranges such as Monte Alen and the Monts de Cristal. The climate is wet tropical with little seasonal variation, rainfall declining from about 2,000 mm a year in the north to 1,200 mm in the south. The ecoregion is a botanical stronghold, holding over 200 strictly endemic plants and three plant families largely confined to tropical Africa, the Huaceae, Medusandraceae, and Scytopetalaceae, while serving as a refuge for the African forest elephant, western lowland gorilla, chimpanzee, and mandrill. Conservation pressure is high, with logging concessions covering nearly the entire region.

Tropical & Subtropical Moist Broadleaf Forests

RESOLVE 6 - Afrotropic

Cross-Niger transition forests

The Cross-Niger transition forests occupy southeastern Nigeria between the Niger River to the west and the Cross River to the east, spanning the states of Abia, Akwa Ibom, Anambra, Ebonyi, and Imo across low, undulating terrain. Once a mosaic of tropical forest and savanna woodland, the surviving rainforest carries characteristic genera such as Brachystegia, Cola, Ficus, Celtis, and Antiaris, alongside the fan palm Borassus aethiopum, grading into drier mixed forest northward. The climate is wet but becomes drier inland, with rainfall declining from south to north and a dry season from December to February. Biologically the region is transitional between the Upper and Lower Guinean forest blocks yet shows extremely low endemism, with the crested chameleon and Sclater's guenon among its few notable species. It is now one of Africa's most densely populated areas, and intensive farming and logging have left its forests in critical, fragmented condition, with large mammals depleted since the 1940s.

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

Cameroon Equatorial Guinea Nigeria

Educator packet

Region packet

Cross-Sanaga-Bioko coastal forests educator packet

Realm

Afrotropic

Dominant biome

Tropical & Subtropical Moist Broadleaf Forests

Approximate area

20,101 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.). Cross-Sanaga-Bioko coastal forests (Cross-Sanaga-Bioko coastal forests). Retrieved 2026, August 20, from https://plotwright.com/regions/resolve-7

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