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Pseudognaphalium obtusifolium

Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium rather than just read about it. In short: Pseudognaphalium obtusifolium, synonyms including Gnaphalium obtusifolium and Pseudognaphalium saxicola, is a member of the family Asteraceae. It is found on open dry sandy habitat throughout eastern North America.

Pseudognaphalium obtusifolium — main illustration
Pseudognaphalium obtusifolium — illustration

Key takeaways

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

Reference excerpt

Pseudognaphalium obtusifolium, synonyms including Gnaphalium obtusifolium and Pseudognaphalium saxicola, is a member of the family Asteraceae. It is found on open dry sandy habitat throughout eastern North America. Common names include old field balsam, rabbit tobacco, sweet everlasting and life everlasting. When crushed, the plant exudes a characteristic maple-syrup scent.

Description It is a biennial herb which grows up to one meter tall. In its first year, the plant produces tightly packed rosettes covered in wooly hair. In the second year, the plant produces a tall stem with alternate leaves and yellow peg-shaped flowerheads. These are borne in clusters. The seeds are dispersed by the wind. Its native habitats include dry clearings, fields, and edges of woods.

Taxonomy Pseudognaphalium obtusifolium was first described by Carl Linnaeus in 1753 as Gnaphalium obtusifolium. It was transferred to Pseudognaphalium in 1981. Populations found in the state of Wisconsin growing on ledges and in cracks in shaded limestone cliff-faces, usually those facing south or east, have been described as Pseudognaphalium saxicola, common name cliff cudweed or rabbit-tobacco. Pseudognaphalium saxicola is listed as Threatened in Wisconsin and is assessed as T2 (Imperiled) by NatureServe, but is regarded by other sources as a synonym of Pseudognaphalium obtusifolium.

Ecology Pseudognaphalium obtusifolium hosts larvae of the American Lady (Vanessa virginiensis) butterfly and its flowers are visited by short-tongued bees, wasps, and flies, while its foliage is eaten by wild turkey and deer. In the garden, it attracts butterflies and bees including specialized bees.

Uses by Native Americans

Alabama tribe The Alabama tribe used a compound decoction of it as a treatment for nervousness and sleepiness, and a decoction as a face wash for nerves and insomnia.

Cherokee The Cherokee use it in a compound for muscle cramps, local pains, and twitching, and apply an infusion of it over scratches made over muscle cramp pain. It is also used internally with Carolina Vetch for rheumatism. A decoction is taken for colds, and the plant is also made into cough syrup. It is used in a sweat bath to treat various diseases, made into a warm liquid blown down throat for clogged throat (diphtheria), chewed for a sore mouth or throat, and smoked for asthma.

Choctaw The Choctaw use a decoction of leaves and blossoms taken for lung pain and colds.

Creek The Creek add the leaves to medicines as a perfume, use a decoction to treat vomiting, as a throat washes for mumps, as a wash "for people who wanted to run away" and as a wash for people who are believed to be afflicted by ghosts. A decoction made of the plant tops are used as a wash for old people who are unable to sleep. They also use a compound decoction of plant tops as an inhalant for colds, and apply a poultice of decoction of leaves for the throat for mumps.

Koasati The Koasati take a decoction of the leaves for fevers, and use it to bathe those who are feverish.

Menominee The Menominee steam the dried leaves as an inhalant for headaches, and as a treatment against "foolishness". They also smudge the leaves and use them to fumigate premises to dispel ghosts, and to bring back "loss of mind". This smudge is also used to revive unconscious patients. The leaf smoke is blown into the nostrils of people who have fainted.

Montagnais The Montagnais use a decoction of the plant for coughing and tuberculosis.

Rappahannock The Rappahannock Tribe take an infusion of the roots for chills, smoke dried leaves or dried stems in a pipe for asthma, and chew the leaves for "fun".

References

Further reading Clemants, Steve and Gracie, Carol Wildflowers in the Field and Forest: A Field Guide to the Northeastern United States Oxford University Press 2006. 294:5 Yatskievych, Kay Field Guide to Indiana Wildflowers Indiana University Press 2000. 229:1149

Illustrations

Pseudognaphalium obtusifolium illustration
Pseudognaphalium obtusifolium illustration

Worked examples

Example 1 — a first encounter with Pseudognaphalium obtusifolium

Start with the simplest possible case. Write down what Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium

In research
Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium 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
Pseudognaphalium obtusifolium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Botanical taxa named by Carl Linnaeus, Flora of Northern America, NatureServe secure species, so understanding it makes those chapters shorter.
In everyday life
Look for Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Pseudognaphalium obtusifolium means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Pseudognaphalium obtusifolium out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pseudognaphalium obtusifolium in simple terms?

Pseudognaphalium obtusifolium, synonyms including Gnaphalium obtusifolium and Pseudognaphalium saxicola, is a member of the family Asteraceae. It is found on open dry sandy habitat throughout eastern North America.

Why does Pseudognaphalium obtusifolium 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 Pseudognaphalium obtusifolium?

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 Pseudognaphalium obtusifolium.

Tags

  • Botanical taxa named by Carl Linnaeus
  • Flora of Northern America
  • NatureServe secure species
  • Plants described in 1753
  • Plants used in traditional Native American medicine
  • Pseudognaphalium

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