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 Dahlia 7.1

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Dahlia is a genus of bushy tuberous herbaceous perennial plants native to Mexico A member of theAsteraceae or Compositae dicotyledonous plants related species include the sunflower daisy chrysanthemum and zinnia There are 42 species of dahlia with hybrids commonly grown as garden plants Flower forms are variable with one head per stem these can be as small as 5 cm 2 in diameter or up to 30 cm 1 ft dinner plate This great variety results from dahlias being octoploidsthat is they have eight sets of homologous chromosomes whereas most plants have only two In addition dahlias also contain manytransposonsgenetic pieces that move from place to place upon an allelewhich contributes to their manifesting such great diversity
The stems are leafy ranging in height from as low as 30 cm 12 in to more than 1824 m 68 ft 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
The dahlia was declared the national flower of Mexico in 1963 The tubers were grown as a food crop by the Aztecs but this use largely died out after the Spanish Conquest Attempts to introduce the tubers as a food crop in Europe were unsuccessful
Dahlias are annual blooming plants with mostly tuberous roots While some have herbaceous stems others have stems which lignify in the absence of secondary tissue and resprout following winter dormancy allowing further seasons of growth As a member of theAsteraceae the flower head is actually a composite hence the older name Compositae with both central disc florets and surrounding ray florets Each floret is a flower in its own right but is often incorrectly described as a petal particularly by horticulturists The modern name Asteraceae refers to the appearance of a star with surrounding rays
In the language of flowers Dahlias represent dignity and instability as well as meaning my gratitude exceeds your care
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A flower sometimes known as a bloom or blossom is the reproductive structure found in plants that are floral The biological function of a flower is to effect reproduction usually by providing a mechanism for the union of sperm with eggs Flowers may facilitate outcrossing or allow selfing Some flower produce diaspores without fertilization parthenocarpy Summer Flowers contain sporangia and are the site where gametophytes develop Many Nature have evolved to be attractive to animals so as to cause them to be vectors for the transfer of pollen After fertilization the ovary of the flower develops into fruit containing seeds
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