biology

Ruellia humilis

Ruellia humilis 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 Ruellia humilis rather than just read about it. In short: Ruellia humilis (wild petunia, fringeleaf wild petunia, hairy petunia, low wild petunia) is a species of flowering plant in the family Acanthaceae. It is native to the eastern United States.

Key takeaways

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

Reference excerpt

Ruellia humilis (wild petunia, fringeleaf wild petunia, hairy petunia, low wild petunia) is a species of flowering plant in the family Acanthaceae. It is native to the eastern United States. It is grown as an ornamental plant. Ruellia humilis is native to the U.S. from the northeastern/northern central to the southeastern/southern central regions. According to the Germplasm Resources Information Network of the United States Department of Agriculture, Ruellia humilis is native to the following states: Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, (eastern) Kansas, Kentucky, Louisiana, Maryland, Michigan, (southeastern) Minnesota, Mississippi, Missouri, Nebraska, (western) North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, (eastern) Texas, West Virginia, Wisconsin, and Virginia. It is not well-known or used much in conventional nurseries or gardens, but use in gardens has been increasing as native plants become more popular. It is usually about one foot high, but can get to two feet high. Its leaves are oppositely arranged, around 2.5 inches long by 1 inch wide, and are light green to medium green with entire margins. The stems and leaves are covered with soft white hairs. The funnel-shaped 5-lobed flowers are about 1.5 to 2.5 inches in diameter and resemble petunias, as does the rest of the plant. The lavender flowers bloom in July into September and open in the morning and fall off in the evening.

Ecology Ruellia humilis grows in dry to average soil in full sun to part shade conditions. Its habitats include prairies, glades, meadows, and open woodland environments. It grows well in dry, shallow, and rocky soils. It has been observed to have a high level of richness of arbuscular mycorrhizal fungi(AMF) diversity when located in calcareous plots as compared to acidic plots. With the general exclusive presence of Ruellia humilis in the United States set, there is more data that indicates, more specifically, the type of biome and regions that this plant shows up in more often. One case study sampling from Buettner Xeric Limestone Prairies, Illinois, Monroe County revealed that when comparing frequency of the plant, the plant had 70% presence in the eastern region of prairie and only 3% in the western region prairie. To place this data in perspective, the eastern region's vegetation covered about 38% of the surface while the western region's vegetation covered about 33.5% of its surface. Both regions' "rock was between 17% and 19%, and bare ground and litter was from 40% to 44%."

As host plant This plant is a host plant for the common buckeye butterfly.

References

Illustrations

Worked examples

Example 1 — a first encounter with Ruellia humilis

Start with the simplest possible case. Write down what Ruellia humilis 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 Ruellia humilis 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 Ruellia humilis 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 Ruellia humilis

In research: Ruellia humilis 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 Ruellia humilis 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: Ruellia humilis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Flora of Alabama, Flora of the Eastern United States, Garden plants, so understanding it makes those chapters shorter.
In everyday life: Look for Ruellia humilis 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 Ruellia humilis in 20 minutes

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

Frequently asked questions

What is Ruellia humilis in simple terms?

Ruellia humilis (wild petunia, fringeleaf wild petunia, hairy petunia, low wild petunia) is a species of flowering plant in the family Acanthaceae. It is native to the eastern United States.

Why does Ruellia humilis 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 Ruellia humilis?

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 Ruellia humilis.