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Seasonal Flowers Series 7 stamps from Japan

Seasonal Flowers Series 7 stamps from Japan
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This is the seventh issue of the Japanese Furusato Stamps to introduce various flowers that represent four seasons of Japan. The seventh series features various flowers in autumn. The stamps depict Dahlia, Chrysanthemum, Celosia argentea, Commelina communis and Rosa.

Dahlia  is a genus of bushy, tuberous, herbaceous perennial plants native mainly in Mexico, but also Central America, and Colombia. There are at least 36 species of dahlia, with hybrids commonly grown as garden plants. This great variety results from dahlias being octoploids—that is, they have eight sets of homologous chromosomes, whereas most plants have only two. The stems are leafy, ranging in height from as low as 30 cm to more than 1.8–2.4 m. The majority of species do not produce scented flowers or cultivars. Like most plants that do not attract pollinating insects through scent, they are brightly colored, displaying most hues, with the exception of blue.

Chrysanthemums are flowering plants of the genus Chrysanthemum in the family Asteraceae. They are native to Asia and northeastern Europe. Most species originate from East Asia and the center of diversity is in China. There are about 40 valid species. There are countless horticultural varieties and cultivars.

Celosia argentea, commonly known as plumed cockscomb, is a plant of tropical origin, and is known for its very bright colors. Celosia argentea is a tender annual that is often grown in gardens. It is propagated by seeds. The seeds are extremely small, up to 43,000 seeds per ounce. The Century cultivars are usually taller, and are bright red, yellow, orange, or pink. The Kimono cultivars are generally smaller, and have more muted colors, though similar to the Century cultivars. Other colors, such as white, burgundy, orange-red, etc., can be found.

Commelina communis, commonly known as the Asiatic dayflower, is an herbaceous annual plant in the dayflower family. It gets its name because the blooms last for only one day. It is native throughout much of East Asia and northern parts of Southeast Asia. In Japan it is known as tsuyukusa, meaning "dew herb". It has also been introduced to parts of central and southeastern Europe and much of eastern North America, where it has spread to become a noxious weed. It is common in disturbed sites and in moist soil. The flowers emerge from summer through fall and are distinctive with two relatively large blue petals and one very reduced white petal.

A rose is a woody perennial of the genus Rosa, within the family Rosaceae. There are over 100 species. They form a group of plants that can be erect shrubs, climbing or trailing with stems that are often armed with sharp prickles. Flowers vary in size and shape and are usually large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwest Africa. Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Rose plants range in size from compact, miniature roses, to climbers that can reach 7 meters in height. Different species hybridize easily, and this has been used in the development of the wide range of garden roses.

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