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Ribes

life science Maturity 5-7 Next article →

Ribes is a large genus of flowering plants containing approximately 200 known species.

Ribes rubrum a1
Ribes rubrum a1

These plants belong to the family Grossulariaceae. They are primarily found in the temperate regions of the Northern Hemisphere. Some species also grow in the mountainous areas of South America. You might recognize them as currants or gooseberries. These plants are important for food, gardening, and forest ecology. They serve as food for many animals and even humans.

Most Ribes species grow as medium-sized shrubs. They show a great deal of diversity in their physical forms. Their leaves are often palmately lobed or compound in shape. Some species even feature sharp thorns on their stems. The flowers are bisexual, meaning they contain both male and female parts. These flowers grow on structures called racemes. The colors of the flowers can range from green to yellow or red. The sepals of the flower are larger than the petals. These sepals fuse together to form a saucer-shaped tube. The ovary is positioned inferiorly, which means it sits below the attachment of the other flower parts. This ovary eventually matures into a berry containing many seeds.

Schwarze Johannisbeeren
Schwarze Johannisbeeren

The way scientists classify Ribes has changed over many years. In 1907, researchers began classifying the genus on a worldwide basis. For a time, some experts treated Ribes and Grossularia as two separate genera. However, the current scientific consensus is to view them as a single genus. This genus is divided into several subgenera. The main subgenera are Ribes, which includes currants, and Grossularia, which includes gooseberries. Scientists use molecular phylogenetics, or the study of genetic relationships, to understand these groups. Even with these modern tools, some evidence remains contradictory. Currently, there is not enough resolution to justify further major taxonomic revisions.

Grossulariaceae Fuchsia flowered Gooseberry Ribes speciosum
Grossulariaceae Fuchsia flowered Gooseberry Ribes speciosum

Within these subgenera, there are many specific sections. For example, the subgenus Ribes contains sections like Berisia, which includes alpine currants. It also includes Coreosma, which contains black currants, and Ribes, which contains red currants. The subgenus Grossularia is divided into four sections: Grossularia, Robsonia, Hesperia, and Lobbia. Some scientists previously treated Hesperia and Lobbia as their own subgenera. Modern molecular analysis shows that Grossularia is a monophyletic group. This means all species in that group share a single common ancestor. This group includes two main lineages, including the glabrous, or smooth, gooseberries.

Grossulariaceae Fuchsia flowered Gooseberry Ribes speciosum
Grossulariaceae Fuchsia flowered Gooseberry Ribes speciosum

Ribes species play a vital role in their local ecosystems. Most species rely on insects for pollination. However, a few species like Ribes sanguineum are pollinated by hummingbirds. Once the fruit matures, animals help disperse the seeds. Birds and mammals such as deer, elk, and grizzly bears eat the berries. This allows the seeds to be spread to new locations. Some insects also rely on Ribes. For instance, the larvae of certain Lepidoptera, or moths, use these plants as hosts. The Buff-tip moth prefers species like Ribes alpinum. Other moths, like the winter moth, can become pests in agricultural settings.

Humans use Ribes in many different ways. Many species produce edible berries, such as blackcurrants, redcurrants, and whitecurrants. The European gooseberry, Ribes uva-crispa, is also widely known. Some people use Ribes for ornamental purposes in gardens. For example, flowering currants are grown for their beauty. Historically, different cultures have used Ribes for medicine. The Blackfoot people used blackcurrant root to treat kidney problems. The Cree used the fruit of Ribes glandulosum to assist with fertility. In North America, European immigrants often turned red and white currants into wine.

Schwarze Johannisbeeren
Schwarze Johannisbeeren

Despite their many uses, Ribes can also impact forest health. They are the main alternate host for white pine blister rust. This is a fungal pathogen known as Cronartium ribicola. The fungus moves from Ribes plants to five-needle pine trees. Infection usually happens in late summer or early fall. This occurs because moderate temperatures and high humidity help the spores germinate. In the United States, many states have strict laws regarding Ribes. States like Michigan, New York, and North Carolina have restrictions to prevent the spread of this rust. Some states even prohibit the planting of certain species like Ribes nigrum to protect their pine forests.

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File:Schwarze Johannisbeeren.jpg
Schwarze Johannisbeeren.jpg
File:Ribes rubrum a1.jpg
Ribes rubrum a1.jpg
File:Grossulariaceae Fuchsia flowered Gooseberry Ribes speciosum.jpg
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