biology

Populus nigra

Populus nigra 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 Populus nigra rather than just read about it. In short: Populus nigra, the black poplar, is a species of cottonwood poplar, the type species of section Aigeiros of the genus Populus, native to Europe, southwest and central Asia, and northwest Africa. Description Black poplars are medium- to large-sized deciduous trees, reaching 20–30 m, and rarely 40 m tall.

Key takeaways

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

Reference excerpt

Populus nigra, the black poplar, is a species of cottonwood poplar, the type species of section Aigeiros of the genus Populus, native to Europe, southwest and central Asia, and northwest Africa.

Description Black poplars are medium- to large-sized deciduous trees, reaching 20–30 m, and rarely 40 m tall. Their leaves are diamond-shaped to triangular, 5–8 cm long and 6–8 cm broad, and green on both surfaces. Normally, their trunks achieve up to 1.5 m in diameter, but some unusual individual trees in France have grown old enough to have much larger trunks – more than 3 metres DBH (Diameter at Breast Height). The species is dioecious (male and female flowers are on different plants), with flowers in catkins and pollination achieved by the wind. The black poplar grows in low-lying areas of moist ground. Like most other pioneer species, the tree is characterized by rapid growth and is able to colonize open areas quickly.

Subspecies Three subspecies are established and some botanists distinguish a fourth:

P. n. subsp. nigra. Central and eastern Europe. Leaves and shoots glabrous (hairless); bark grey-brown, thick and furrowed.

P. n. subsp. betulifolia (Pursh) W.Wettst. North-west Europe (France, Great Britain, Ireland). Leaf veins and shoots finely downy; bark grey-brown, thick and furrowed, often with heavy burrs, trunk usually heavily leaning. P. n. subsp. caudina (Ten.) Bugała. Mediterranean region, also southwest Asia if var. afghanica not distinguished. P. n. var. afghanica Aitch. & Hemsl. (syn. P. n. var. thevestina (Dode) Bean). Southwest Asia; treated as a cultivar of P. nigra by many botanists, and as a distinct species P. afghanica by others; bark smooth, nearly white; leaves and shoots as subsp. caudina (see also cultivars, below). The subspecies P. n. betulifolia is one of the rarest trees in Great Britain and Ireland, with only about 7,000 trees known, of which only about 600 have been confirmed as female.

Cultivars Several cultivars have also been selected, these being propagated readily by cuttings:

'Italica' was originally selected in Lombardy, northern Italy, in the 17th century. The growth is fastigiate (having the branches more or less parallel to the main stem), with a very narrow crown. Common in the Mediterranean region, it is adapted to hot, dry summers and grows poorly in humid conditions, being short-lived due to fungal diseases. It is a male clone. Around 40 to 50 years, this short-lived variety starts shedding branches and is very likely to be blown over in high winds, each successive tree lost exposing neighbouring trees, creating a domino effect.

Plantierensis group clones are derived by crossing 'Italica' with P. nigra ssp. betulifolia at the Plantières Nursery near Metz in France in 1884; they are similar to 'Italica' (and often mistaken for it), but with a slightly broader crown, and better adapted to the cool, humid climate of northwest Europe, where the true Lombardy poplar does not grow well. Both male and female clones are grown. This is the tree most commonly grown in Great Britain and Ireland as Lombardy poplar. 'Manchester' is a cultivar of P. nigra subsp. betulifolia widely planted in northwest England. It is a male clone, and currently seriously threatened by poplar scab disease. 'Gigantea' is another fastigiate clone, of unknown origin, with a rather broader, more vigorous crown than 'Italica'. It is a female clone. 'Afghanica' (syn. 'Thevestina'): most, if not all, specimens are of a single clone, and many botanists therefore treat it as a cultivar rather than a botanical variety. It is fastigiate, similar to 'Italica', but with a striking whitish bark; it also differs from 'Italica' in being a female clone. This is the common fastigiate poplar in southwest Asia and southeast Europe (the Balkans), where it was introduced during the Ottoman Empire period.

Distribution Black poplar has a large distribution area throughout Europe and is also found in northern Africa and central and west Asia. The distribution area extends from the Mediterranean in the south to around 64° latitude in the north and from the British Isles in the west to Kazakhstan and China in the east. The distribution area also includes the Caucasus and large parts of the Middle East.

See also The Green Cathedral Babisnau poplar

References

External links

(French) Conservation of genetic resources of Populus nigra Populus nigra - distribution map, genetic conservation units and related resources. European Forest Genetic Resources Programme (EUFORGEN)

Illustrations

Worked examples

Example 1 — a first encounter with Populus nigra

Start with the simplest possible case. Write down what Populus nigra 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 Populus nigra 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 Populus nigra 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 Populus nigra

In research: Populus nigra 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 Populus nigra 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: Populus nigra is common in secondary-school and first-year university syllabi. It links to neighbouring topics Botanical taxa named by Carl Linnaeus, Flora of Europe, Flora of North Africa, so understanding it makes those chapters shorter.
In everyday life: Look for Populus nigra 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 Populus nigra in 20 minutes

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

Frequently asked questions

What is Populus nigra in simple terms?

Populus nigra, the black poplar, is a species of cottonwood poplar, the type species of section Aigeiros of the genus Populus, native to Europe, southwest and central Asia, and northwest Africa. Description Black poplars are medium- to large-sized deciduous trees, reaching 20–30 m, and rarely 40 m…

Why does Populus nigra 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 Populus nigra?

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 Populus nigra.