biology

Ulmus serotina

Ulmus serotina 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 serotina rather than just read about it. In short: Ulmus serotina, the September elm, is an autumn-flowering North American species of tree. It is uncommon beyond Tennessee; it is only very locally distributed through Illinois, Kentucky, Arkansas, Mississippi, Oklahoma, Alabama, and Georgia, and disjunct populations into Nuevo León, Mexico.

Key takeaways

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

Reference excerpt

Ulmus serotina, the September elm, is an autumn-flowering North American species of tree. It is uncommon beyond Tennessee; it is only very locally distributed through Illinois, Kentucky, Arkansas, Mississippi, Oklahoma, Alabama, and Georgia, and disjunct populations into Nuevo León, Mexico. It grows predominantly on limestone bluffs and along streams to elevations of 400 m.

Description Rarely exceeding 20 m in height, the tree has a rounded crown with spreading to pendulous branches. The glabrous young shoots become progressively corky-winged with age, and bear oblong to obovate leaves <8 cm long. The wind-pollinated apetalous perfect flowers form pendulous racemes, which open in September and serve to distinguish the species from its cogenitor, the cedar elm U. crassifolia, with which it readily hybridizes. The samarae are oblong-elliptical, 10–15 mm in length, deeply divided at the apex, and ripen in November.

Pests and diseases The species is highly susceptible to Dutch elm disease.

Cultivation Before the outbreak of Dutch elm disease, U. serotina enjoyed limited popularity as a shade tree in the southern part of its range. The tree grows well on most soils, but is intolerant of anaerobic or saline conditions; it is also frost tolerant to -30°C (-23°F). The September elm is very rare in cultivation in Europe; it was briefly propagated and marketed in the UK by the Hillier and Sons nursery, Winchester, Hampshire, from 1972 to 1977, when 16 were sold. It is not known to have been introduced to Australasia. No cultivars of this taxon are known, nor is it known to be in commerce.

Notable trees The current US national champion, measuring 28.65 meters high in 2013, grows in the Spring Grove Cemetery in Hamilton County, Ohio. The former national champion measured at 25.5 m high in 2007, grows in Davidson County, Tennessee.

Hybrids Ulmus × arkansana [: U. serotina × U. crassifolia ]. Present in Arkansas and Oklahoma.

Accessions North America Mildred E. Mathias Botanical Garden, UCLA, Los Angeles, California, US. (No details available) Morton Arboretum, US. Acc. no. 1039-23. U S National Arboretum [1], Washington, D.C., US. Acc. no. 55431. Europe Grange Farm Arboretum, Sutton St James, Spalding, Lincolnshire, UK. Acc. no. not known. Royal Botanic Garden Edinburgh, UK. Acc. no. 20080091, from seed wild collected in USA. Royal Botanic Gardens, Kew, UK. Acc. no. not known. Royal Botanic Gardens, Wakehurst Place, UK. Acc. no. 2006-143. Sir Harold Hillier Gardens, UK. Acc. no. 2004.1059, 3 trees, collected in Tennessee, 2004. Thenford House arboretum, Banbury, UK. No details available. University of Copenhagen, Botanic Garden, Denmark. No details available.

References

Illustrations

Worked examples

Example 1 — a first encounter with Ulmus serotina

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

In research: Ulmus serotina 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 serotina 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 serotina is common in secondary-school and first-year university syllabi. It links to neighbouring topics Elm species and varieties, Flora of Nuevo León, IUCN Red List least concern species, so understanding it makes those chapters shorter.
In everyday life: Look for Ulmus serotina 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 serotina in 20 minutes

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

Frequently asked questions

What is Ulmus serotina in simple terms?

Why does Ulmus serotina 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 serotina?

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 serotina.