biology

Peniocereus greggii

Peniocereus greggii 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 Peniocereus greggii rather than just read about it. In short: Peniocereus greggii is a cactus species native to southern United States and Mexico. Description This cactus grows as a shrub with branching stems.

Key takeaways

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

Reference excerpt

Peniocereus greggii is a cactus species native to southern United States and Mexico.

Description

This cactus grows as a shrub with branching stems. It has gray green stems about 1.2 centimeters wide and around 3 meters long with 6–9 edges or wings. The areoles have a central 2 millimeters long white spine and 9 dark radial spines that are shorter than 1 millimeter. Its flowers are white, up to 15-30 centimeters long and 5 to 7.5 centimeters in diameter with a scent redolent of vanilla. The floral tube is covered with small spines. The flowers open after sundown, closing and wasting after a few hours. By 9 am the next day they are gone. They usually bloom one night a year in June or July. In any given area, they all bloom at the same time. The fruit is oval and 5 to 7.5 centimeters long. They have a large tuber that tastes a bit like a potato. This tuber can be up to 60 cm (24 in) in length and weigh up to 57 kg (126 lb). Chromosome count is 2n = 22. Tohono Chul in Tucson, Arizona has the largest private collection of Sonoran Desert native Night-blooming Cereus – Peniocereus greggii. Each summer this botanical garden/museum hosts "Bloom Night", the one night each summer it is predicted the greatest number of cereus flowers will be in bloom, opening from 6pm until midnight to allow guests to stroll the grounds and view the flowers.

Subspecies There are two recognized subspecies:

Distribution Plants are found in Arizona, New Mexico (Dona Ana, Grant, Hidalgo, and Luna County), Texas (Big Bend Region), USA; and Chihuahua, Coahuila, Durango, Sonora, and Zacatecas (Mexico) at elevations of 300 to 1500 meters. They tend to be ubiquitous throughout the higher Sonoran Desert area around Tucson. Plants grow in silty soil with desert scrub and plants such as Larrea divaricata and Neltuma glandulosa.

Taxonomy The plant was first described as Cereus greggii in 1848 by George Engelmann. Nathaniel Lord Britton and Joseph Nelson Rose placed the species in the genus Peniocereus in 1909. Common names include Arizona queen of the night, nightblooming cereus and Reina de la noche. The species name greggii honors Josiah Gregg (1806–1850), a merchant, explorer, naturalist, and author of the American Southwest and Northern Mexico.

See also Nightblooming cereus – for others, and especially Selenicereus grandiflorus List of edible cacti

References

External links Desert-tropicals.com: Night Blooming Cereus, Reina de la Noche. Scientific Name: Peniocereus greggii Archived 2004-02-03 at the Wayback Machine Time lapse of plant from bud to bloom Archived 2008-03-02 at the Wayback Machine

External links Media related to Peniocereus greggii at Wikimedia Commons Data related to Peniocereus greggii at Wikispecies

Illustrations

Worked examples

Example 1 — a first encounter with Peniocereus greggii

Start with the simplest possible case. Write down what Peniocereus greggii 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 Peniocereus greggii 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 Peniocereus greggii 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 Peniocereus greggii

In research: Peniocereus greggii 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 Peniocereus greggii 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: Peniocereus greggii is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cacti of Mexico, Cacti of the United States, Flora of Arizona, so understanding it makes those chapters shorter.
In everyday life: Look for Peniocereus greggii 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 Peniocereus greggii in 20 minutes

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

Frequently asked questions

What is Peniocereus greggii in simple terms?

Peniocereus greggii is a cactus species native to southern United States and Mexico. Description This cactus grows as a shrub with branching stems.

Why does Peniocereus greggii 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 Peniocereus greggii?

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 Peniocereus greggii.