biology

Ulmus glaucescens

Ulmus glaucescens 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 Ulmus glaucescens rather than just read about it. In short: Ulmus glaucescens Franch., the Gansu elm, is a small deciduous tree from the northern provinces of China, where it is found along river valleys and on mountain slopes at elevations of 2000–2600 m. Description Although typically no more than 10 m in height, U. glaucescens can occasionally reach 18 m.

Key takeaways

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

Reference excerpt

Ulmus glaucescens Franch., the Gansu elm, is a small deciduous tree from the northern provinces of China, where it is found along river valleys and on mountain slopes at elevations of 2000–2600 m.

Description Although typically no more than 10 m in height, U. glaucescens can occasionally reach 18 m. Slow growing, the tree is possessed of a stiff branching pattern resembling that of a young American elm. The bark is longitudinally fissured and occasionally exhibits a peeling, mottled pattern. However, the tree is most easily distinguished by its small leaves; ranging from ovate to lanceolate, their size rarely exceeds 5 cm in length by 2.5 cm breadth, and are borne on twigs devoid of corky wings or layers. The perfect wind-pollinated apetalous flowers are produced on second-year shoots in March–April; the samarae are elliptic, < 25 mm long, and can remain on the tree until the end of May.

Pests and diseases The tree is resistant to Dutch elm disease; it is also very resistant to the elm leaf beetle Xanthogaleruca luteola.

Cultivation The tree is notable for its resistance to extreme drought which, combined with its high resistance to the elm leaf beetle in the United States, has made it a contender for establishment on the Great Plains. Like most other Asiatic species, it is intolerant of wet ground. The tree is very rare in cultivation, but was one of a number of Chinese elms assessed for their horticultural potential at the Morton Arboretum, Illinois, during the last quarter of the 20th century. It is not known to have been introduced to Australasia. There are no known cultivars of this taxon, nor is it known to be in commerce.

Subspecies & varieties Two varieties are recognized: var. glaucescens Rehder, and var. lasiocarpa L.K.Fu.

Accessions North America Brenton Arboretum, US. No accession details available. Morton Arboretum, US. Acc. nos. 429-2008, 537-76, 486-2016, 708-2016, 729-2016. United States National Arboretum Washington, D.C., US. Acc. nos. 76225, 76226, 76243, 76248. Europe Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 1130.

References

External links efloras.org: U. glaucescens leaves and fruit illustration efloras.org: U. glaucescens description Photographs labelled U. glaucescens on Plant Photo Bank of China, ppbc.iplant

Worked examples

Example 1 — a first encounter with Ulmus glaucescens

Start with the simplest possible case. Write down what Ulmus glaucescens 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 Ulmus glaucescens 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 Ulmus glaucescens 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 Ulmus glaucescens

In research: Ulmus glaucescens 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 Ulmus glaucescens 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: Ulmus glaucescens is common in secondary-school and first-year university syllabi. It links to neighbouring topics Elm species and varieties, Flora of China, Trees of Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Ulmus glaucescens 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 Ulmus glaucescens in 20 minutes

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

Frequently asked questions

What is Ulmus glaucescens in simple terms?

Ulmus glaucescens Franch., the Gansu elm, is a small deciduous tree from the northern provinces of China, where it is found along river valleys and on mountain slopes at elevations of 2000–2600 m. Description Although typically no more than 10 m in height, U. glaucescens can occasionally reach 18 m.

Why does Ulmus glaucescens 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 Ulmus glaucescens?

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 Ulmus glaucescens.