biology

Oxydendrum

Oxydendrum 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 Oxydendrum rather than just read about it. In short: Oxydendrum arboreum ( OK-sih-DEN-drəm ar-BOR-ee-əm), commonly known as sourwood or sorrel tree, is the sole species in the genus Oxydendrum, in the family Ericaceae. It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains.

Key takeaways

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

Reference excerpt

Oxydendrum arboreum ( OK-sih-DEN-drəm ar-BOR-ee-əm), commonly known as sourwood or sorrel tree, is the sole species in the genus Oxydendrum, in the family Ericaceae. It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains. The tree is frequently seen as a component of oak-heath forests.

Growth

Sourwood is a small tree or large shrub, growing to 10–20 m (33–66 ft) tall with a trunk up to 50 cm (20 in) diameter. Occasionally on extremely productive sites, this species can reach heights in excess of 30 meters and 60 cm diameter. The leaves are alternately arranged, deciduous, 8–20 cm (3.1–7.9 in) long and 4–9 cm (1.6–3.5 in) broad, with a finely serrated margin; they are dark green in summer, but turn vivid red in fall. The flowers are white, bell-shaped, 6–9 mm ( 1/4 to 1/3 inch) long, produced on 15–25 cm (5.9–9.8 in) long panicles. The fruit is a small woody capsule. The roots are shallow, and the tree grows best when there is little root competition; it also requires acidic soils for successful growth. The leaves can be chewed (but should not be swallowed) to help alleviate a dry-feeling mouth.

Description

The bark is gray with a reddish tinge, deeply furrowed and scaly. Branchlets at first are light yellow green, but later turn reddish brown. The wood is reddish brown, with paler sapwood; it is heavy, hard, and close-grained, and will take a high polish. Its specific gravity is 0.7458, with a density of 46.48 lb/cu ft. The winter buds are axillary, minute, dark red, and partly immersed in the bark. Inner scales enlarge when spring growth begins. Leaves are alternate, four to seven inches long, 1.5 to 2.5 inches wide, oblong to oblanceolate, wedge-shaped at the base, serrate, and acute or acuminate. Leaf veins are feather-veined, the midrib is conspicuous. They emerge from the bud revolute, bronze green and shining, and smooth; when full-grown, they are dark green, shining above, and pale and glaucous below. In autumn, they turn bright scarlet. Petioles are long and slender, with stipules wanting. They are heavily laden with acid. In June and July, cream-white flowers are borne in terminal panicles of secund racemes seven to eight inches long; rachis and short pedicels are downy. The calyx is five-parted and persistent; lobes are valvate in bud. The corolla is ovoid-cylindric, narrowed at the throat, cream-white, and five-toothed. The 10 stamens are inserted on the corolla; filaments are wider than the anthers; anthers are two-celled. The pistil is ovary superior, ovoid, and five-celled; the style is columnar; the stigma is simple; the disk is ten-toothed, and ovules are many. The fruit is a capsule, downy, five-valved, five-angled, and tipped by the persistent style; the pedicels are curving.

Cultivation and uses The sourwood is hardy in the north and a worthy ornamental tree in lawns and parks. Its late bloom makes it desirable, and its autumnal coloring is particularly beautiful and brilliant. The leaves are heavily charged with acid, and to some extent have the poise of those of the peach. The leaves are also a laxative. Sourwood is renowned for the honey that bees produce from the nectar of its flowers. Juice from its blooms is used to make sourwood jelly. The shoots were used by the Cherokee and the Catawba to make arrowshafts.

In Appalachian culture Sourwood Mountain is a popular old-time tune in the Appalachian region of the United States.

Gallery

References

External links

Oxydendrum arboreum images at bioimages.vanderbilt.edu Oxydendrum arboreum images, locations all over the world at PlantNet.org

Illustrations

Worked examples

Example 1 — a first encounter with Oxydendrum

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

In research: Oxydendrum 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 Oxydendrum 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: Oxydendrum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Flora of the Appalachian Mountains, IUCN Red List least concern species, Medicinal plants of North America, so understanding it makes those chapters shorter.
In everyday life: Look for Oxydendrum 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 Oxydendrum in 20 minutes

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

Frequently asked questions

What is Oxydendrum in simple terms?

Why does Oxydendrum 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 Oxydendrum?

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 Oxydendrum.