biology

Kohekohe

Kohekohe is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Kohekohe rather than just read about it. In short: Kohekohe (Didymocheton spectabilis) is a medium-sized tree in the Meliaceae family, native to New Zealand. It is found in lowland and coastal forests throughout most of the North Island and also occurs in the Marlborough Sounds in the north of the South Island.

Key takeaways

Kohekohe belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kohekohe to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kohekohe from memory before moving on to harder problems.

Reference excerpt

Kohekohe (Didymocheton spectabilis) is a medium-sized tree in the Meliaceae family, native to New Zealand. It is found in lowland and coastal forests throughout most of the North Island and also occurs in the Marlborough Sounds in the north of the South Island. Mature trees grow up to 15 metres (50 ft) in height, with a trunk up to a metre in diameter.

Name The name kohekohe is derived from Proto-Polynesian *kofe meaning a type of bamboo (ʻohe); its thickening leaf stem bases may have reminded early Polynesian settlers to those of the ʻohe. A fairly close relative of true mahogany (Swietenia), it is also called New Zealand mahogany, because its wood is light, strong and polishes to a fine red colour.

Description Kohekohe is notable for having characteristics normally associated with trees growing in the tropics, for example, its flowers and fruit grow directly from the trunk or branches (known as cauliflory), and it has large, glossy, pinnate leaves up to 40 cm (16 in) in length. The inflorescences of kohekohe may be up to 30 cm (12 in) long, and the flowers produce a strong sweet smell. The large green fruit takes around fifteen months to ripen. The fruit contains three or four cells containing a seed encased in a fleshy orange-coloured aril. The tree does not flower in the year while the fruit capsules are maturing, and therefore individual trees may flower in alternate years.

Habitat/Distribution Kohekohe forest used to be common in damp coastal and lowland areas in the North Island, but these forests have mostly disappeared because the land was used for settlement or they were browsed by possums. Studies have shown rapid recovery in kohekohe canopy after implementation of possum control. Kohekohe was probably the dominant vegetation cover on Kapiti Island before it was cleared in the early 19th century for cultivation and farming. The kohekohe forest on Kapiti is recovering after possums were eradicated in 1986.

Uses Māori boiled the bark in water and drank it as a tonic. The wood was used for building waka but it is soft and not as durable as other woods and tends to rot quickly. It is valued for carving and, since older trees are often hollow, for making waka.

Gallery

Taxonomy Kohekohe was first described by Georg Forster in 1786 as Trichilia spectabilis, and was transferred to the genus, Dysoxylum, in 1864 by Joseph Hooker. A study published in 2021 found that Dysoxylum was paraphyletic, and the species was reclassified into the revived genus Didymocheton.

References

External links

Maori uses: Medicinal plants, Trees & Shrubs: Kohekohe, Dysoxylum at the Wayback Machine (archived 8 February 2013) Dysoxylum spectabile: Images and occurrence data from GBIF

Illustrations

Worked examples

Example 1 — a first encounter with Kohekohe

Start with the simplest possible case. Write down what Kohekohe claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Kohekohe before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Kohekohe ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Kohekohe

In research: Kohekohe appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Kohekohe in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Kohekohe is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cauliflory, Didymocheton, Plants described in 1786, so understanding it makes those chapters shorter.
In everyday life: Look for Kohekohe outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Kohekohe in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kohekohe means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Kohekohe out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kohekohe in simple terms?

Why does Kohekohe matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Kohekohe?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Kohekohe.