biology

Lobelia inflata

Lobelia inflata 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 Lobelia inflata rather than just read about it. In short: Lobelia inflata, also known as Indian tobacco or puke weed, is a species of Lobelia native to eastern North America, from southeastern Canada (Nova Scotia to southeast Ontario) south through the eastern United States to Alabama and west to Kansas. Description Lobelia inflata is an annual or biennial herbaceous plant growing to 15–100 cm (5.9–39.4 in) tall, with stems covered in tiny hairs.

Key takeaways

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

Reference excerpt

Lobelia inflata, also known as Indian tobacco or puke weed, is a species of Lobelia native to eastern North America, from southeastern Canada (Nova Scotia to southeast Ontario) south through the eastern United States to Alabama and west to Kansas.

Description

Lobelia inflata is an annual or biennial herbaceous plant growing to 15–100 cm (5.9–39.4 in) tall, with stems covered in tiny hairs. Its leaves are usually about 8 cm (3.1 in) long, and are ovate and toothed. They are alternately arranged. It has violet colored flowers that are tinted yellow on the inside, and usually appear in mid-summer and continue to bloom into fall. The seedcases are small, brown, dehiscent, and papery.

Propagation Propagation is usually accomplished by cuttings or seed. Seeds are sown in containers in mid spring or mid fall. The seeds take about 2 weeks to germinate.

Ecology Lobelia inflata is pollinated by small bees including sweat bees.

Traditional uses and adverse effects Lobelia inflata has a long use as a medicinal plant as an entheogenic, emetic, and skin or respiratory aid. Native Americans used it for respiratory and muscle disorders, as a purgative, and as a ceremonial medicine. The leaves were chewed and smoked. The plant was used as a traditional medicinal plant by the Cherokee, Iroquois, Penobscot, and other indigenous peoples. The foliage was burned by the Cherokee as a natural insecticide, to smoke out gnats. Although it may be used medicinally, consuming lobelia causes adverse effects, which may include sweating, nausea, vomiting, diarrhea, tremors, rapid heartbeat, mental confusion, convulsions, hypothermia, coma, or possibly death. The root is toxic and can be fatal if eaten.

Chemical constituents Lobelia inflata contains multiple alkaloid compounds, including lobeline, norlobelanine, lobelanidine, and radicamine, among other compounds, such as flavonoids, terpenes, alkynes, and coumarins. Lobeline concentration is highest in the seeds.

References

External links USDA Plants Profile for Lobelia inflata (Indian-tobacco) Lobelia inflata - Plants For A Future database report Indian Tobacco (Lobelia inflata) Archived 2007-10-08 at the Wayback Machine

Illustrations

Worked examples

Example 1 — a first encounter with Lobelia inflata

Start with the simplest possible case. Write down what Lobelia inflata 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 Lobelia inflata 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 Lobelia inflata 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 Lobelia inflata

In research: Lobelia inflata 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 Lobelia inflata 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: Lobelia inflata is common in secondary-school and first-year university syllabi. It links to neighbouring topics Botanical taxa named by Carl Linnaeus, Entheogens, Flora of Eastern Canada, so understanding it makes those chapters shorter.
In everyday life: Look for Lobelia inflata 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Lobelia inflata” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Lobelia inflata in 20 minutes

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

Frequently asked questions

What is Lobelia inflata in simple terms?

Why does Lobelia inflata 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 Lobelia inflata?

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 Lobelia inflata.