biology

Ribes

Ribes 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 Ribes rather than just read about it. In short: Ribes ( RY-beez) is a genus of approximately 200 known species of flowering plants, predominantly native to the temperate regions of the Northern Hemisphere. Ribes is the sole genus in the plant family Grossulariaceae.

Key takeaways

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

Reference excerpt

Ribes ( RY-beez) is a genus of approximately 200 known species of flowering plants, predominantly native to the temperate regions of the Northern Hemisphere. Ribes is the sole genus in the plant family Grossulariaceae. The genus includes species commonly referred to as redcurrants, blackcurrants, whitecurrants, and gooseberries. Several species are cultivated both for their edible fruit and as ornamental plants in horticulture. Ribes are the main alternate host for white pine blister rust, a fungal pathogen impacting five-needle pines.

Description Ribes species are medium shrub-like plants with marked diversity in flowers and fruit. They have either palmately lobed or compound leaves, and some have thorns. Ribes flowers are bisexual and are borne on racemes. Flower color can range from green to yellow or red depending on the species. The sepals of the flowers are larger than the petals, and fuse into a tube of saucer shape. The ovary is inferior, maturing into a berry with many seeds.

Taxonomy Ribes is the single genus in the Saxifragales family Grossulariaceae. Although once included in the broader circumscription of Saxifragaceae sensu lato, it is now positioned as a sister group to Saxifragaceae sensu stricto.

Subdivision First treated on a worldwide basis in 1907, the infrageneric classification has undergone many revisions, and even in the era of molecular phylogenetics there has been contradictory evidence. Although sometimes treated as two separate genera, Ribes and Grossularia (Berger 1924), the consensus has been to consider it as a single genus, divided into a number of subgenera, the main ones of which are subgenus Ribes (currants) and subgenus Grossularia (gooseberries), further subdivided into sections. Janczewski (1907) considered six subgenera and eleven sections. Berger's twelve subgenera based on two distinct genera (see Senters & Soltis (2003) Table 1) have subsequently been demoted to sections. Weigend (2007) elevated a number of sections to produce a taxonomy of seven subgenera; Ribes (sections Ribes, Heretiera, Berisia) Coreosma, Calobotrya (sections Calobotrya, Cerophyllum), Symphocalyx, Grossularioides, Grossularia, Parilla. Taxonomy, according to Berger, modified by Sinnott (1985):

Subgenus Ribes L. (currants) 8 sections Section Berisia Spach (alpine currants) Section Calobotrya (Spach) Jancz. (ornamental currants) Section Coreosma (Spach) Jancz. (black currants) Section Grossularioides ( Jancz.) Rehd. (spiny or Gooseberry-stemmed currants) Section Heritiera Jancz. (dwarf or skunk currants) Section Parilla Jancz. (Andine or South American currants) Section Ribes L. (red currants) Section Symphocalyx Berland. (golden currants) Subgenus Grossularia (Mill.) Pers. (Gooseberries) 4 sections Section Grossularia (Mill.) Nutt. Section Robsonia Berland. Section Hesperia A.Berger Section Lobbia A. Berger Some authors continued to treat Hesperia and Lobbia as subgenera. Early molecular studies suggested that subgenus Grossularia was actually embedded within subgenus Ribes. Analysis of combined molecular datasets confirms subgenus Grossularia as a monophyletic group, with two main lineages, sect. Grossularia and another clade consisting of glabrous gooseberies, including Hesperia, Lobbia and Robsonia. Other monophyletic groups identified were Calobotrya, Parilla, Symphocalyx and Berisia. However, sections Ribes, Coreosma and Heritiera were not well supported. Consequently, there is insufficient resolution to justify further taxonomic revision.

Species

There are around 200 species of Ribes. Selected species include:

Ribes alpinum Ribes aureum Ribes cereum Ribes divaricatum Ribes glandulosum Ribes hirtellum Ribes hudsonianum Ribes inerme Ribes lacustre Ribes laurifolium Ribes lobbii Ribes montigenum Ribes maximowiczii Ribes nevadense Ribes nigrum Ribes oxyacanthoides Ribes rubrum Ribes sanguineum Ribes speciosum Ribes triste Ribes uva-crispa

Distribution and habitat Ribes is widely distributed through the Northern Hemisphere, and also extending south in the mountainous areas of South America. Species can be found in meadows or near streams.

Ecology The majority of Ribes species are insect pollinated. Exceptions include R. sanguineum, R. malvaceum, and R. speciosum, which are humming-bird pollinated. After the flowers are pollinated and the fruits have matured, Ribes seeds are dispersed by birds and mammals, including elk, deer, cattle, and grizzly bears. Currants are used as a food source by the larvae of some Lepidoptera species. Buff-tip moth caterpillars have shown strong preferences for Ribes species as host plants, especially R. alpinum and R. uva-crispa. The larvae of the moth species Archips argyrospilus, Papaiema nebris, Itame ribearia, and Nematocampa limbata are also associated with Ribes herbivory. Specifically winter moths and currant clearwing moths are known pests of currant species within agricultural settings.

Cultivation The genus Ribes includes the edible currants: blackcurrant, redcurrant, and white currant, as well as the European gooseberry, Ribes uva-crispa, and several hybrid varieties. It should not be confused with the dried currants used in cakes and puddings, which are from the Zante currant, a small-fruited cultivar of the grape Vitis vinifera. Ribes gives its name to the popular blackcurrant cordial Ribena. The genus also includes the group of ornamental plants collectively known as the flowering currants, for instance, R. sanguineum.

United States There are restrictions on growing some Ribes species in some U.S. states, as they are the main alternate host for white pine blister rust.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Ribes

Start with the simplest possible case. Write down what Ribes 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 Ribes 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 Ribes 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 Ribes

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

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

Frequently asked questions

What is Ribes in simple terms?

Why does Ribes 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 Ribes?

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 Ribes.