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Forest Mahogany

Trichilia dregeana

SA tree no: 300

English: Forest Mahogany, Forest Natal Mahogany, Natal Mahogany, Cape Mahogany, Red Mahogany, Thunder Tree, Christmas Bells, Red Ash

Afrikaans: Rooiessenhout, Bosrooiessenhout, Basteressenhout

Xhosa: Umkhuhlu, Umgwengwe

Zulu: Umkuhlu, Umkhuhlu, Umkhulu, Umgwenya-wehlathi

Tsonga: Nkwahlamfu

Swati: Umkhuhlu

Venda: Mutuhulu

Historical scientific names: Trichilia emetica subsp. dregeana, Trichilia emetica var. dregeana

Trichilia dregeana, commonly known as the Forest Mahogany, is a majestic evergreen tree native to South Africa. It's easily recognised by its dense, spreading canopy of dark, glossy green leaves, its rough, corky grey bark, and especially by its vibrant, three-lobed fruits that burst open to reveal shiny black seeds adorned with bright scarlet-red casings.

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Distinguishing features:

A large, evergreen tree with a dense, spreading crown.
Has dark, glossy green, large leaves with 3–5 pairs of leaflets.
Features rough, corky, grey bark that often has distinctive raised knobs or 'bosses'.
Produces fragrant, creamy white flowers in summer.
Bears showy, woody, three-lobed fruits (capsules) that turn yellowish-brown when ripe.
Fruits split open to reveal shiny black seeds each covered in a vivid scarlet-red aril (fleshy coating).

Overall appearance:

Trichilia dregeana is a large, single-stemmed, evergreen tree that develops a dense, rounded or spreading crown. It is a striking tree, particularly when adorned with its dark green foliage and colourful, persistent fruits.

Height:

In dense forests, it can reach impressive heights of up to 30 metres. In more open areas, it typically grows to between 10–20 metres tall.

Leaves:

Large, dark glossy green leaves that are arranged alternately along the stems.
They are imparipinnate, meaning they are compound leaves with an odd number of leaflets.
Each leaf typically has 3–5 pairs of leaflets.
The leaflets are large, measuring up to 200 mm long and 90 mm wide, and are broadly oval to oblong-elliptic in shape, often asymmetrical at their base.
The tip (apex) of the leaflets can be blunt or sharply pointed.
The margins (edges) of the leaves are entire (smooth).
Young leaves often have a reddish tint.
The veins on the leaves are prominent, especially on the underside.

Flowers:

Flowers are cream, creamy-yellow, or greenish-white in colour.
They are strongly scented, making them appealing to pollinators.
Borne in axillary panicles, which are branched clusters of flowers that grow from the leaf axils (where the leaf joins the stem).
Trichilia dregeana is monoecious, meaning both male and female flowers are found on the same tree, though individual flowers are effectively unisexual.
The calyx (outer part of the flower) is short.
There are 5 spatulate (spoon-shaped) petals.
The staminal tube (structure formed by fused stamens) is short, with 10–12 anthers (pollen-producing parts).
Female flowers have a noticeably hairy ovary.

Flowering season:

The Forest Mahogany typically flowers during the summer months, from October to December in South Africa.

Fruits:

The fruit is a woody, somewhat flattened, spherical capsule.
It measures about 30–40 mm in diameter.
Initially green, the capsules turn a yellowish-brown colour as they ripen.
When mature, the fruit splits into three distinct valves (lobes) to reveal its contents.
Inside, there are 3–6 large, shiny black seeds.

Seeds:

Each seed is shiny black and measures about 15 mm long.
Importantly, each seed is partly covered by a striking, fleshy, waxy, scarlet-red aril (a bright fleshy covering). This vibrant red makes the seeds very noticeable once the fruit opens.

Bark:

The bark of Trichilia dregeana varies from light grey to dark brown. It is characteristically rough, corky, and often ridged or fissured. Sometimes, it may flake off in irregular pieces. A distinguishing feature is the presence of distinctive raised 'bosses' or corky knobs on the bark.

Wood:

The wood of the Forest Mahogany is light in weight, relatively soft, and has a pinkish-red hue. It is known for being durable and easy to work with.

Soil type:

Trichilia dregeana prefers fertile, well-drained soil to thrive.

Aspect:

This tree prefers to grow in full sun or partial shade. When young, it needs protection from frost. It also requires consistent moisture, especially during dry periods.

Edibility:

While the tree's fruits are consumed by wildlife, they are not typically eaten by humans. The seed oil is purgative, indicating it has medicinal properties but is not a food source.

Toxicity:

The seed oil is known to be purgative.

Uses:

Timber: The wood is highly valued. It is used for making furniture, canoes, flooring, decorative carving, and general construction due to its durability and ease of working.
Traditional Medicine: Various parts of the tree are used in traditional African medicine. The bark, leaves, and roots are prepared to treat a range of ailments, including dysentery, stomach complaints, intestinal worms, and fever.
Oil Production: The seeds yield a non-drying oil that has been traditionally used for making soap, as lamp oil, and for lubrication.
Shade Tree: With its large size and dense, spreading crown, it makes an excellent shade tree for spacious gardens, parks, and other large open areas.
Animal Food: The leaves of Trichilia dregeana are browsed by various game animals.

Ecology:

Pollination: The strongly scented, creamy white flowers are primarily pollinated by insects, particularly moths, which are attracted to their fragrance, especially at night.
Seed Dispersal: The vibrant, red-arilled seeds are a major attraction for birds such as turacos, hornbills, barbets, and starlings, as well as monkeys. These animals eat the fleshy aril and, in doing so, help to disperse the seeds to new locations.
Mammalian Forage: The seeds themselves are also eaten by rodents and other small mammals.
Habitat and Food: The tree provides important food resources (leaves and fruits) and shelter for a wide array of forest animals.
Larval Host Plant: Trichilia dregeana serves as a larval host plant for various butterfly species, meaning their caterpillars feed on its leaves before transforming.

Distribution and habitat:

Trichilia dregeana is indigenous to Southern Africa with a widespread natural distribution.

South African Provinces: It is naturally found in the Western Cape, Eastern Cape, KwaZulu-Natal, Mpumalanga, Limpopo, and North West provinces of South Africa.
Beyond SA: Its natural range extends northwards into Zimbabwe, Swaziland, and Mozambique.
Habitat: This tree primarily grows in evergreen forests, including coastal dune forests, riverine forests (along rivers), and montane forests. It can also be found on rocky outcrops and frequently grows along forest margins.

Derivation of name:

The genus name, Trichilia, comes from the Greek words trich- or tricho-, which mean 'three'. This is a direct reference to the distinctive three-lobed fruits that are a characteristic feature of this genus.
The specific epithet, dregeana, honours Johann Franz Drege (1794–1881). Drege was a renowned German botanical collector who extensively explored and documented the plant life of South Africa during the 19th century.

Historical aspects:

Trichilia dregeana has a long and significant history in Southern Africa. For centuries, its bark, leaves, and roots have been an important part of traditional medicine, used by various indigenous communities for a wide range of ailments. Furthermore, the tree has historically been a valuable source of durable timber, prized for its workability and use in making furniture, canoes, and other wooden items. Its economic and cultural importance has been well-established over generations.

Interesting facts:

The name Trichilia actually means 'three' in Greek, which is a clever nod to the three-lobed fruits that are so distinct on this tree!
Those striking scarlet-red casings on its seeds aren't just for show – they're a tasty treat for birds and monkeys, who then help the tree plant its seeds in new places!
Unlike many trees that rely on bees or butterflies, the Forest Mahogany's creamy, strongly scented flowers are a big hit with moths, especially at night!
The tree is named after Johann Franz Drege, a German botanist who basically travelled all over South Africa collecting and studying plants – talk about a dedicated explorer!

Growing tips:

Propagation: You can easily grow new Forest Mahogany trees from fresh seeds.
Seeds: Before sowing, it's important to remove the bright red, fleshy aril from around the black seeds. Sow the cleaned seeds in a well-drained, sandy loam soil.
Germination: Seeds usually germinate within 4 to 6 weeks.
Initial Growth: Be patient! Seedlings tend to grow slowly at first.
Planting: It's best to plant them when they are still young to help them establish well.
Soil: This tree prefers fertile and well-drained soil conditions.
Aspect: Plant it where it will receive full sun or partial shade.
Frost Protection: Young trees are sensitive to frost, so they will need protection, especially in colder areas.
Watering: Keep the soil consistently moist, particularly during dry periods, as this tree appreciates good moisture levels.

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