science

Myrtales

Myrtales is a science 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 Myrtales rather than just read about it. In short: The Myrtales are an order of flowering plants, in the malvid clade of the rosid group of dicotyledons. Well-known members of Myrtales include: myrtle, pōhutukawa, bay rum tree, clove, guava, acca (feijoa), allspice, eucalyptus, crape myrtles, henna tree, pomegranate, water caltrop, loosestrifes, cupheas (cigar plants), evening primroses, fuchsias, willowherbs, white mangrove, leadwood tree, African birch, Koster's c…

Key takeaways

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

Reference excerpt

The Myrtales are an order of flowering plants, in the malvid clade of the rosid group of dicotyledons. Well-known members of Myrtales include: myrtle, pōhutukawa, bay rum tree, clove, guava, acca (feijoa), allspice, eucalyptus, crape myrtles, henna tree, pomegranate, water caltrop, loosestrifes, cupheas (cigar plants), evening primroses, fuchsias, willowherbs, white mangrove, leadwood tree, African birch, Koster's curse, and velvet tree.

Taxonomy Myrtales include the following nine families, according to the APG III system of classification:

Alzateaceae Combretaceae (leadwood family) Crypteroniaceae Lythraceae (loosestrife and pomegranate family) Melastomataceae (including Memecylaceae) Myrtaceae (myrtle family; including Heteropyxidaceae, Psiloxylaceae) Onagraceae (evening primrose and Fuchsia family) Penaeaceae (including Oliniaceae, Rhynchocalycaceae) Vochysiaceae The APG III system places the order within the eurosids; this is corroborated by the placement of the Myrtales in the Malvid clade by the One Thousand Plant Transcriptomes Initiative. Myrtales are placed as a sister to the eurosids II clade as of the publishing of the Eucalyptus grandis genome in June 2014. The Cronquist system gives essentially the same composition, except the Vochysiaceae are removed to the order Polygalales, and the Thymelaeaceae are included. The families Sonneratiaceae, Trapaceae, and Punicaceae are removed from the Lythraceae. In the classification system of Dahlgren the Myrtales were in the superorder Myrtiflorae (also called Myrtanae). The APG III system agrees with the older Cronquist circumscriptions of treating Psiloxylaceae and Heteropyxidaceae within Myrtaceae, and Memecyclaceae within Melastomataceae. Ellagitannins are reported in dicotyledoneous angiosperms, and notably in species in the order Myrtales.

Origins Myrtales is dated to around 89–99 million years ago (mya) in Australasia; however, there is some contention as to that date, which was obtained using nuclear DNA. When looking at chloroplast DNA, the myrtales' ancestor is, instead, considered to have evolved during the mid-Cretaceous period (100 mya) in Southeast Africa, rather than in Australasia. Although the APG system classifies myrtales as within the eurosids, the recently published genome of Eucalyptus grandis places the order myrtales as a sister to the eurosids rather than inside them. The discrepancy is thought to have arisen due to the difference between using numerous taxa versus using various genes for constructing a phylogeny.

References

Illustrations

Worked examples

Example 1 — a first encounter with Myrtales

Start with the simplest possible case. Write down what Myrtales claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Myrtales 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 Myrtales 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 Myrtales

In research: Myrtales appears in science 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 Myrtales 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: Myrtales is common in secondary-school and first-year university syllabi. It links to neighbouring topics Angiosperm orders, Myrtales, so understanding it makes those chapters shorter.
In everyday life: Look for Myrtales 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 Myrtales in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Myrtales 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 Myrtales out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Myrtales in simple terms?

Why does Myrtales matter?

Because it connects several science 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 Myrtales?

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 Myrtales.