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Black Stinkwood

Ocotea bullata

SA tree no: 118

English: Black Stinkwood, Stinkwood, Cape laurel, African Acorn, African Oak, Bean Trefoil, Black Laurel, Cannibal Stinkwood, Cape Olive, Cape Stinkwood, Cape Walnut, Laurel Wood, True Stinkwood

Afrikaans: Swartstinkhout, Stinkhout, Laurelhout, Kaapse Lourier, Kaapse Stinkhout, Swart-stinkhout, Swartstinkhoutboom, Witstinkhout

Xhosa: umHlungulu, umNimbithi

Zulu: umNukani, umNukane, umNukani

Synonyms: Borbonia perfoliata, Laurus bullata, Laurus capensis, Laurus perfoliata, Ocotea bullata var. bullata, Ocotea bullata var. grandifolia, Ocotea pubescens, Oreodaphne bullata, Oreodaphne fynbosensis, Oreodaphne pubescens

Ocotea bullata, famously known as Stinkwood or Stinkhout, is a truly iconic and magnificent evergreen tree of the South African forests, including those in the Eastern Cape. It gets its memorable name from the strong, unpleasant smell of its freshly cut timber (don't worry, the smell fades as it dries!).

This stately tree has distinctive, glossy, dark green leaves, often with characteristic "blisters" or "bullae" on the upper surface – a key identification feature. Its small, inconspicuous flowers develop into oval, black berries that sit in a cup-like structure, making them a favourite food for many forest birds, which are crucial for dispersing its seeds. Stinkwood is highly valued for its exceptionally beautiful and durable timber.

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Distinguishing features:

  • Large, evergreen forest tree.

  • Glossy, dark green leaves, often with characteristic "blisters" or "bullae" on the upper surface.

  • Freshly cut timber has a strong, unpleasant smell (the "stink").

  • Small, inconspicuous greenish-yellow flowers.

  • Produces oval, black berries sitting in a cup-like structure.

  • Highly valued for its timber.


Overall appearance

Ocotea bullata is a large, stately evergreen tree with a dense, spreading crown. Its dark green, glossy leaves provide year-round cover, and its distinctive "blisters" and valuable timber make it a renowned forest species.


Height

Typically 10 m to 30 m tall, but can reach up to 40 m in ideal forest conditions.


Leaves:

  • Simple, alternate arrangement.

  • Ovate (oval) to elliptic (elliptical) shape.

  • Length 50 mm to 100 mm.

  • Glossy, dark green on the upper surface.

  • Characteristically have "blisters" or "bullae" (small, raised swellings) on the upper surface, often near the veins.

  • Lower surface is paler.

  • Petioles (leaf stalks) are short.


Flowers:

  • Small, inconspicuous.

  • Greenish-yellow.

  • Borne in slender, branched clusters (panicles) in the leaf axils (where the leaf meets the stem).

  • Appear from spring to early summer.


Flowering season

October to January (late spring to early summer).


Fruits:

  • Oval drupes (berries).

  • Black when ripe.

  • About 15-20 mm long.

  • Partially enclosed in a cup-like, woody, reddish-brown structure (perianth tube), similar to an acorn in its cup.

  • Ripen from February to April (late summer to autumn).


Seeds:

  • Enclosed within the fruit.

  • Dispersed by birds that eat the fruit.


Bark:

  • Brownish-grey to dark grey.

  • Smooth when young.

  • Becomes fissured (cracked) and rougher with age.


Wood:

  • Exceptionally beautiful, hard, and durable.

  • Colour varies from yellowish-brown to dark brown or almost black, often with attractive figuring.

  • Freshly cut timber has a strong, unpleasant smell that fades as it dries.


Soil type

Prefers deep, moist, well-drained, humus-rich soils found in forests.


Aspect

Prefers shady conditions, especially when young, but can tolerate some sun once mature. Often found in humid, evergreen forests. Frost-tender when young, but more tolerant when mature.

Uses:

  • Timber: Its primary use is for its highly prized, valuable timber, which is exceptionally durable and beautiful. Used for furniture, boat building, musical instruments, and paneling.

  • Ecological: Provides food (berries) for various fruit-eating birds (e.g., Cape Parrot, Knysna Loerie, Rameron Pigeon, Cape Robin-Chat) and other animals, which in turn help disperse its seeds. Essential component of indigenous forest ecosystems.


Ecology:

  • Bird food: The black berries are a vital food source for many forest birds, which are key for seed dispersal.

  • Habitat specialist: Primarily found in indigenous evergreen forests, indicating its need for specific environmental conditions (moist, shady, rich soil).

  • Slow growing: It is a slow-growing tree, especially when young, but can live for many centuries.


Distribution and habitat:

  • Endemic to South Africa.

  • Found along the coastal and escarpment forests from the Cape Peninsula in the Western Cape, through the Eastern Cape, KwaZulu-Natal, Mpumalanga, to Limpopo province.

  • Dominant or co-dominant species in many indigenous forests.

  • Grows in evergreen forest, riverine fringe forest, and along ravines.


Derivation of name:

  • The genus name Ocotea is derived from the Guyanese common name for a species in this genus.

  • The species name bullata is Latin for 'blistered' or 'puckered', referring to the characteristic raised swellings (bullae) found on the upper surface of its leaves.

  • Common name "Stinkwood" refers to the pungent odour of the freshly cut timber, which fades as the wood dries. "Cape Laurel" refers to its Laurel family connection and Cape distribution.


Historical aspects

Stinkwood timber has been highly prized since colonial times, leading to over-exploitation and making it a protected tree. Its history is closely tied to the logging of South Africa's indigenous forests.


Interesting facts:

  • The Stinkwood tree gets its unusual name because its freshly cut wood has a strong, unpleasant smell! Don't worry though, the smell completely disappears once the timber dries out.

  • Its leaves are really unique – they often have little "blisters" or raised bumps on the upper surface, which is a fantastic way to identify this tree!

  • While its flowers are tiny, its berries are a huge hit with birds, especially the famous Cape Parrots and Knysna Loeries. These birds help spread the seeds, keeping the forests healthy!

  • Stinkwood timber is considered one of the most beautiful and valuable woods in the world! It's so durable and attractive that it's used for making exquisite furniture and even musical instruments.


Growing tips:

  • Planting location: Ocotea bullata is best suited for large gardens or areas where you want to establish an indigenous forest look. It needs plenty of space and is ideal as a specimen tree. It thrives in shaded, moist conditions when young.

  • Soil and watering: Requires deep, moist, well-drained, and humus-rich soil. It is a forest tree, so it needs consistent moisture, especially during dry periods.

  • Aspect: Prefers shady conditions when young and throughout its life, especially in hotter climates. It can tolerate some sun once mature. It is sensitive to frost when young, so protect it in cold areas.

  • Growth rate: Ocotea bullata is a slow-growing tree. Be patient, as it takes many years to reach its full majestic size.

  • Propagation: Primarily grown from fresh seeds. Seeds: Collect the berries when ripe (February to April), clean the flesh off, and sow them fresh. Germination can be slow and erratic. Cuttings: Difficult to root from cuttings.

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