science

Pontederia sagittata

Pontederia sagittata 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 Pontederia sagittata rather than just read about it. In short: Pontederia sagittata is a species of aquatic plant belonging to the family Pontederiaceae. Description It is a perennial plant with erect, rhizomatous tough stems.

Key takeaways

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

Reference excerpt

Pontederia sagittata is a species of aquatic plant belonging to the family Pontederiaceae.

Description It is a perennial plant with erect, rhizomatous tough stems. Basal leaves, emerging; pods 10–27 cm, the apex emarginate; petioles up to 1 m, not inflated, sometimes reddish; Blades 8-32 x 5–19 cm, lanceolate, the base cordate, the apex acute. Inflorescence with more than 50 flowers; flowers arranged in groups of 3, 4 or more along the peduncle, sessile; peduncle (6-)10-20(-22) cm, thick, hairy to hairy or rarely glabrous; internode between spathes (3.5-)5-16(-20) cm; blade of lower spathe 8-32 x 5–19 cm; upper spathe (3-)4-7(-9) cm, open on the upper 1/2, the apex mucronulate. 1.5 cm flowers. Perianth lilac or rarely white, externally hairy-glandular; outer lobes c. 6mm; internal lobes c. 6mm Long filaments 6–9 mm, with glandular hairs in the upper 1/3, short ones 0.7-3.5 mm, with glandular hairs in the upper 1/3; anthers of upper whorl 0.75–1 mm, yellow; anthers of lower whorl 0.55-0.85 mm, yellow. Pistil 3–6 mm; style hairy towards apex; stigma 3-lobed. Utricles 5–6 mm, deltiform, with smooth rib edges; seeds 2.3-2.5 mm, smooth, obovoid, covered by a mucilaginous layer with an oily appearance.

Taxonomy Pontederia sagittata was first described by Carl Presl in 1827. It has sometimes been reduced to a form or variety of Pontederia cordata.

Distribution and habitat Pontederia sagittata has a discontinuous distribution, being native from Mexico to Central America and then eastern and southern Brazil. It is found on the edges of rivers, lagoons, ponds, and swamps, at altitudes of up to 1,500 m (4,900 ft).

References

Illustrations

Worked examples

Example 1 — a first encounter with Pontederia sagittata

Start with the simplest possible case. Write down what Pontederia sagittata 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 Pontederia sagittata 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 Pontederia sagittata 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 Pontederia sagittata

In research: Pontederia sagittata 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 Pontederia sagittata 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: Pontederia sagittata is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquatic plants, Flora of Brazil, Flora of Central America, so understanding it makes those chapters shorter.
In everyday life: Look for Pontederia sagittata 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 “Pontederia sagittata” →

Affiliate

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

How to study Pontederia sagittata in 20 minutes

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

Frequently asked questions

What is Pontederia sagittata in simple terms?

Pontederia sagittata is a species of aquatic plant belonging to the family Pontederiaceae. Description It is a perennial plant with erect, rhizomatous tough stems.

Why does Pontederia sagittata 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 Pontederia sagittata?

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 Pontederia sagittata.