science

Sagittaria sagittifolia

Sagittaria sagittifolia 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 Sagittaria sagittifolia rather than just read about it. In short: Sagittaria sagittifolia (also called arrowhead because of the shape of its leaves) is an Old World flowering plant in the family Alismataceae. Description Sagittaria sagittifolia is a herbaceous perennial plant, growing in water from 10–50 centimetres (4–19+1⁄2 inches) deep.

Key takeaways

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

Reference excerpt

Sagittaria sagittifolia (also called arrowhead because of the shape of its leaves) is an Old World flowering plant in the family Alismataceae.

Description

Sagittaria sagittifolia is a herbaceous perennial plant, growing in water from 10–50 centimetres (4–19+1⁄2 inches) deep. The leaves above water are arrowhead-shaped, the leaf blade 15–25 cm (6–10 in) long and 10–22 cm (4–8+1⁄2 in) broad, on a long petiole holding the leaf up to 45 cm (17+1⁄2 in) above water level. The plant also has narrow linear submerged leaves, up to 80 cm (31+1⁄2 in) long and 2 cm broad. Panicled flowers are 2–2.5 cm broad, with three small sepals and three white petals, and numerous purple stamens.

Distribution and habitat It is native to wetlands in most of Europe (it is extinct in Spain) and Asia in Finland and Bulgaria, in Russia, Ukraine, Siberia, Turkey and the Caucasus. It is also cultivated as a food crop in some other countries. In Britain it is the only native species of Sagittaria.

Ecology S. sagittifolia can be weedy or invasive according to the USDA, Animal and Plant Health Inspection Service, Plant Protection and Quarantine. It also appears on state noxious weed lists for 46 states.

Uses The round tuber is edible. It is starchy with a bland flavour and a texture similar to a potato but somewhat crunchier, even when cooked. In Japan, it is known as kuwai クワイ (慈姑) and its tuber is eaten particularly during the New Year. In China, it is known as 慈姑 cígū and often used in winter hot pots. In Vietnam, the plant's young petiole leaves and rhizomes are used for soups.

Remnants of Sagittaria sagittifolia have been found in the Paleolithic/Mesolithic site of Całowanie in Poland. S. sagittifolia is used in Chinese medicine, and in 2006 seven new ent-rosane diterpenoids and a new labdane diterpene were purified from the plant. Four of these compounds (Sagittine A–D) exhibited antibacterial activity against Streptococcus mutans and Actinomyces naeslundii while another (Sagittine E) was only active against A. naeslundii (MIC = 62.5 μg ml–1). Recently, the same group identified five new diterpenoids from Sagittaria pygmaea. None displayed activity against A. actinomycetemcomitans, while four of the others were active against A. viscosus and three against S. mutans, of which 18-ß-D-3',6'-diacetoxyglucopyranosyl-ent-kaur-16-ene was the most active.

References

External links Sorting Sagittaria names Photo of Sagittaria sagittifolia tubers

Illustrations

Worked examples

Example 1 — a first encounter with Sagittaria sagittifolia

Start with the simplest possible case. Write down what Sagittaria sagittifolia 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 Sagittaria sagittifolia 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 Sagittaria sagittifolia 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 Sagittaria sagittifolia

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

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

Frequently asked questions

What is Sagittaria sagittifolia in simple terms?

Sagittaria sagittifolia (also called arrowhead because of the shape of its leaves) is an Old World flowering plant in the family Alismataceae. Description Sagittaria sagittifolia is a herbaceous perennial plant, growing in water from 10–50 centimetres (4–19+1⁄2 inches) deep.

Why does Sagittaria sagittifolia 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 Sagittaria sagittifolia?

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 Sagittaria sagittifolia.