science

Hygrophila polysperma

Hygrophila polysperma is a science 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 Hygrophila polysperma rather than just read about it. In short: Hygrophila polysperma, commonly known as dwarf hygrophila, dwarf hygro, Miramar weed, Indian swampweed or Indian waterweed, is an aquatic plant in the family Acanthaceae. It is native to Bangladesh, India, China and Malaysia, and has also been introduced to the US states of Florida, Texas and possibly Virginia.

Key takeaways

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

Reference excerpt

Hygrophila polysperma, commonly known as dwarf hygrophila, dwarf hygro, Miramar weed, Indian swampweed or Indian waterweed, is an aquatic plant in the family Acanthaceae. It is native to Bangladesh, India, China and Malaysia, and has also been introduced to the US states of Florida, Texas and possibly Virginia. It is listed on the Federal Noxious Weed List in the US and is illegal to import and sell in a number of states including Kansas and South Carolina.

Cultivation and uses Indian waterweed first appeared in the aquarium trade in 1945 under the name "oriental ludwigia". It is easy to grow and as such a popular plant for the tropical aquarium. It will grow even faster in good light, a nutrient rich water / substrate and it benefits from additional CO2. May need to be pruned regularly. Propagated from cuttings. An isolated leaf will often root itself. Hygrophila polysperma is readily available in the aquarium trade thanks to its ease of growth and reproduction. It will accept most water parameters. When used in aquascaping it is often placed towards the back of the aquarium, as a large group of stems. Some people prefer not to introduce Hygrophila polysperma into their tanks as it can rapidly grow out of control, taking light and nutrients away from more other plants. The leaves turn a shade of pink or orange as they grow closer to the light source. Many people find that this plant produces too many new shoots and eventually becomes a nuisance. It is a good plant for quickly filling a planted aquarium, using its new shoots to propagate new plants in a matter of days.

References

Further reading Angerstein MB, Lemke DE. 1994. First records of the aquatic weed Hygrophila polysperma (Acanthaceae) from Texas. Sida 16:365-71 Innes WT. 1947. Hygrophila, a new aquarium plant. The Aquarium 16:30-1 Les DH, Wunderlin RP. 1981. Hygrophila polysperma (Acanthacae). Florida Scientist 44:189-92 Schmitz DC. 1985. Hygrophila polysperma, A review of the scientific literature. Tech. report. Tallahassee: Fla. Dept. of Natural Resources. 15 pp. Vandiver VV. 1980. Hygrophila. Aquatics 2:4-11

External links Media related to Hygrophila polysperma at Wikimedia Commons Tropica Invasive Aquatic Plants

Illustrations

Worked examples

Example 1 — a first encounter with Hygrophila polysperma

Start with the simplest possible case. Write down what Hygrophila polysperma claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Hygrophila polysperma 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 Hygrophila polysperma 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 Hygrophila polysperma

In research: Hygrophila polysperma appears in science 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 Hygrophila polysperma 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: Hygrophila polysperma is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquatic plants, Flora of China, Flora of Indo-China, so understanding it makes those chapters shorter.
In everyday life: Look for Hygrophila polysperma 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 “Hygrophila polysperma” →

Affiliate

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

How to study Hygrophila polysperma in 20 minutes

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

Frequently asked questions

What is Hygrophila polysperma in simple terms?

Why does Hygrophila polysperma matter?

Because it connects several science 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 Hygrophila polysperma?

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 Hygrophila polysperma.