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Dianthus

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Dianthus is a large genus of flowering plants within the family Caryophyllaceae. This group includes approximately 340 different species found across the globe. Most of these plants are native to Europe and Asia. However, some species grow in North Africa and southern Africa. One specific species, D. repens, is found in arctic North America.

People recognize these plants by several common names. They are often called carnations, pinks, or sweet william. These names help people identify them in gardens and flower shops.

Most species in this genus are herbaceous perennials. This means they are plants that live for more than two years. A few species are annuals, which live for one year, or biennials, which live for two. Some plants in the genus grow as low subshrubs. These subshrubs develop woody stems at their base. The leaves are typically simple and grow in opposite pairs. They often appear in shades of grey-green or blue-green.

This coloring is often described as glaucous.

The flowers of the Dianthus genus are very distinctive. Most species feature five petals that have a frilled or pinked margin. This term refers to a decorative, zigzag edge. While most flowers are shades of pink, one species named D. knappii has yellow petals with a purple centers. Many perennial pinks are also famous for their strong, spicy fragrance. The name "Dianthus" itself has ancient roots. It comes from the Greek words "Dios," meaning of Zeus, and "anthos," meaning flower. The Greek botanist Theophrastus cited this name long ago.

In nature, these plants play a vital role in local ecosystems. They serve as essential food plants for the larvae of several Lepidoptera species. These include the cabbage moth, the double-striped pug, the large yellow underwing, and the lychnis. Some insects are even more specialized in their diet. Three species of Coleophora case-bearers feed exclusively on Dianthus. These include C. dianthi, C. dianthivora, and C. musculella. Interestingly, C. musculella feeds only on the species D. superbus.

Humans have been breeding these plants for hundreds of years. Since 1717, people have hybridized Dianthus to create thousands of cultivars. These varieties come in white, pink, yellow, and red. Gardeners often sort them into specific groups based on how they grow. Border carnations are fully hardy and grow to large sizes. Perpetual flowering carnations are grown under glass to bloom all year. Malmaison carnations are known for an intense clove fragrance.

Other groups include old-fashioned pinks, modern pinks, and Alpine pinks for rock gardens.

The history of the word "pink" is also connected to these flowers. One theory suggests the color was named after the flower's frilled edges. In the 14th century, the verb "to pink" meant to decorate something with a perforated pattern. This is similar to how pinking shears create zigzag edges on cloth. Another theory links the name to the Dutch word "pinksteren," which refers to Pentecost. This would mean the flowering season gave the color its name.

Dianthus holds significant meaning in various cultures and regions. In the language of flowers, these plants symbolize boldness. Some species serve as official symbols for specific places. The Cheddar pink, or D. gratianopolitanus, is the county flower of Somerset. In Japan, D. japonicus is the official flower of Hiratsuka. Furthermore, the fringed pink, D. superbus, is part of the term "Yamato nadeshiko." This term describes an archetype of a traditional ideal woman in Japanese culture.

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