biology

Ulmus ismaelis

Ulmus ismaelis 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 ismaelis rather than just read about it. In short: Ulmus ismaelis is a small tree discovered circa 1997 in southern Mexico by Ismael Calzada in riparian forest along the Mixteco River system in northeastern Oaxaca, where it grows among large boulders in the limestone canyons. The tree has since been found in Honduras and El Salvador.

Key takeaways

Ulmus ismaelis 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 ismaelis to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ulmus ismaelis from memory before moving on to harder problems.

Reference excerpt

Ulmus ismaelis is a small tree discovered circa 1997 in southern Mexico by Ismael Calzada in riparian forest along the Mixteco River system in northeastern Oaxaca, where it grows among large boulders in the limestone canyons. The tree has since been found in Honduras and El Salvador. The tree is exceptional in its habitat: dry places, sometimes with less than 50 cm (19.7 in) per annum precipitation, and comparatively low altitudes of 450–750 m (1475–2460 ft).

Description Rarely growing to over 15 m (49.2 ft) in height, typically less than 10 m (32.8 ft) with a trunk diameter of 30 cm (1 ft); the tree has exfoliating orangish bark. The ovate leaves are coriaceous, less than 9.6 cm (3.8 in) in length by 4.6 cm (1.8 in) broad, acute at the apex, pinnately veined, on short 2–5 mm (0.08–0.2 in) petioles; the colour ranges from dull green to light brown. The apetalous flowers are arranged as short racemes on leafless twigs, sparsely clustered on less than 7 mm (0.28 in) peduncles. The samarae are less than 22 × 13 mm (0.9 x 0.5 in), tapering at the base to a less than 8 mm (0.3 in) stalk, with ciliate margins, and are shed during June and July in Mexico; in Honduras and El Salvador the tree flowers at the time of foliage change, just before the fall of the leaves of the previous season during the months of February and March, and fructifies from March to the end of April, coinciding with the emergence of the new season's leaves.

Pests and diseases No information available.

Cultivation The tree is extremely rare in cultivation; it was introduced to Europe in 2019 as seed sent to the Grange Farm Arboretum, Lincolnshire, UK. Seedlings were later disseminated by the arboretum to Butterfly Conservation's main trials site, Great Fontley, Hampshire, UK, and the Escuela Tecnica Superior de Ingenieros de Montes, Universidad Politecnica de Madrid, Spain.

Etymology The species is named for the Mexican botanist and collector Dr Juan Ismael Calzada, who discovered the tree.

Accessions

Europe Grange Farm Arboretum, Lincs., UK. Seedlings germinated 2019. Butterfly Conservation elm trials plantation, Great Fontley, Hants., UK. One seedling, germinated 2019.

References

Illustrations

Worked examples

Example 1 — a first encounter with Ulmus ismaelis

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

In research: Ulmus ismaelis 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 ismaelis 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 ismaelis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Elm species and varieties, Endemic flora of Mexico, Tree stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Ulmus ismaelis 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 ismaelis in 20 minutes

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

Frequently asked questions

What is Ulmus ismaelis in simple terms?

Why does Ulmus ismaelis 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 ismaelis?

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 ismaelis.