science

Proteales

Proteales 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 Proteales rather than just read about it. In short: Proteales is an order of flowering plants consisting of three (or four) families. The Proteales have been recognized by almost all taxonomists.

Key takeaways

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

Reference excerpt

Proteales is an order of flowering plants consisting of three (or four) families. The Proteales have been recognized by almost all taxonomists. The representatives of the Proteales can be very different from each other due to their very early divergence. They possess seeds with little or no endosperm. The ovules are often atropic. The oldest fossils of Proteales are of the nelumbonaceous genus Notocyamus from the Barremian stage of the Early Cretaceous of Brazil, 126–121 Ma (million years ago). According to molecular clock calculations, the lineage that led to Proteales split from other plants about 128 Ma or 125 Ma.

Families Within the classification system of Rolf Dahlgren, the Proteales were in the superorder Proteiflorae, also called Proteanae; The APG II system (of 2003) also recognizes this order, placing it in the clade Eudicots, with the following circumscription:

order Proteales family Nelumbonaceae family Proteaceae [+ family Platanaceae] with "+ ..." = optionally separate family (that may be split off from the preceding family). The APG III system of 2009 followed this same approach, but favored the narrower circumscription of the three families, firmly recognizing three families in Proteales: Nelumbonaceae, Platanaceae, and Proteaceae. The Angiosperm Phylogeny Website, however, suggests the addition of Sabiaceae, which the APG III system did not place in any order in the eudicots, would be sensible. The APG IV system of 2016 added family Sabiaceae to the order. Well-known members of the Proteales include the proteas of South Africa, the banksia and macadamia of Australia, the planetree, and the sacred lotus. The origins of the order are clearly ancient, with evidence of diversification in the mid-Cretaceous, roughly over 100 million years ago. Of notable interest is the family's modern distribution; the Proteaceae is predominantly a Southern Hemisphere family, while the Platanaceae and Nelumbonaceae are Northern Hemisphere plants.

Classification The current APG IV classification represents a slight change from the APG I system of 1998, which firmly did accept family Platanaceae as being separate from the order. Under APG IV, this is the current circumscription of the order:

order Proteales family Nelumbonaceae family Platanaceae family Proteaceae family Sabiaceae

Cronquist The Cronquist system of 1981 recognized such an order and placed it in subclass Rosidae in class Magnoliopsida [=dicotyledons]. It used this circumscription:

order Proteales family Elaeagnaceae family Proteaceae

Dahlgren; Thorne; Engler; and Wettstein The Dahlgren system and Thorne system (1992) recognized such an order and placed it in superorder Proteanae in subclass Magnoliidae [=dicotyledons]. The Engler system, in its update of 1964, also recognized this order and placed it in subclass Archichlamydeae of class Dicotyledoneae. The Wettstein system, last revised in 1935, recognized this order and placed it in the Monochlamydeae in subclass Choripetalae of class Dicotyledones. These systems used the following circumscription:

order Proteales family Proteaceae

References

Media related to Proteales at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Proteales

Start with the simplest possible case. Write down what Proteales 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 Proteales 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 Proteales 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 Proteales

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

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

Frequently asked questions

What is Proteales in simple terms?

Proteales is an order of flowering plants consisting of three (or four) families. The Proteales have been recognized by almost all taxonomists.

Why does Proteales 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 Proteales?

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 Proteales.