biology

Pontederia cordata

Pontederia cordata 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 Pontederia cordata rather than just read about it. In short: Pontederia cordata, common name pickerelweed (USA) or pickerel weed (UK), is a monocotyledonous aquatic plant native to the Americas. It grows in a variety of wetlands, including pond and lake margins across an extremely large range from eastern Canada south to Argentina.

Key takeaways

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

Reference excerpt

Pontederia cordata, common name pickerelweed (USA) or pickerel weed (UK), is a monocotyledonous aquatic plant native to the Americas. It grows in a variety of wetlands, including pond and lake margins across an extremely large range from eastern Canada south to Argentina. A few examples include northern rivers, the Everglades and Louisiana.

Ecology The species grows as an emergent plant, that is, in flooded conditions, so the plant is generally dependent upon aerenchyma in the stem to carry oxygen into the roots. Its metabolism is, however, also tolerant of low soil oxygen. It is often found in areas where water levels fluctuate naturally, with spring flooding and later summer emergence. Apart from flooding, the species is also influenced by soil fertility, tending to grow in the more fertile bays of large lakes, for example. Like many aquatic plants, it is negatively affected by salinity and grazing. It is also negatively affected by competition from other wetland plants. Like many wetland plants, it can survive unfavorable conditions as buried seeds in the soil. In a 36-year study on this species in a sinkhole pond, it was found to have an inverse relationship with American Lotus (Nelumbo lutea), declining in years with high American lotus abundance and increasing in years in with low American lotus abundance.

Flowers The plant flowers in late summer. The slate blue flowers have yellow markings which may assist in attracting bees for pollination. Two species known to pollinate the flowers are Melissodes apicatus and Dufourea novaeangliae. Once the plant begins to produce seeds, the stem supporting the inflorescence bends to submerge the fruits and seeds. Seeds are dormant at the time of dispersal and will not germinate without stratification for 6–8 weeks. The flowers of the species are tristylous, meaning the styles of individual plants occur in three different morphs, with most populations containing all three. Leaf shape, which varies considerably across populations, within populations, and even within individuals, has been the source for many taxonomic synonyms. Like many wetland and aquatic plants, the species can reproduce asexually by means of branching rhizomes, and hence can form large clonal stands.

The small seed pods are green and warty, and are released into the water when ripe.

Cultivation This plant is cultivated as an ornamental garden pond plant, and has gained the Royal Horticultural Society's Award of Garden Merit.

Uses The young leafstalks can be eaten raw (with the unripe fruits stripped off) or cooked. The seeds are edible raw, and can be ground into grain.

References

External links

PLANTS Profile for Pontederia cordata Pontederia cordata, Natural Resources Canada Pontederia cordata Flowers in Israel

Illustrations

Worked examples

Example 1 — a first encounter with Pontederia cordata

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

In research: Pontederia cordata 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 Pontederia cordata 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 cordata is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquatic plants, Botanical taxa named by Carl Linnaeus, Edible plants, so understanding it makes those chapters shorter.
In everyday life: Look for Pontederia cordata 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 Pontederia cordata in 20 minutes

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

Frequently asked questions

What is Pontederia cordata in simple terms?

Why does Pontederia cordata 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 Pontederia cordata?

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 cordata.