Dahlia White flower in the Garden. A member of the Asteraceae 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 octoploidsââ¬âthat is, they have eight sets of homologous chromosomes, whereas most plants have only two. In addition, dahlias also contain many transposonsââ¬âgenetic pieces that move from place to place upon an alleleââ¬âwhich contributes to their manifesting such great diversity.
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標準授權 | S | 800 x 452 | JPG | 15 | |
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標準授權 | L | 2973 x 1681 | JPG | 20 | |
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進階授權 | WEL | 6649 x 3759 | JPG | 88 | |
進階授權 | PEL | 6649 x 3759 | JPG | 88 | |
進階授權 | UEL | 6649 x 3759 | JPG | 88 |
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標準授權 | 480 x 271 px | JPG | 13 點 |
標準授權 | 800 x 452 px | JPG | 15 點 |
標準授權 | 2303 x 1302 px | JPG | 18 點 |
標準授權 | 2973 x 1681 px | JPG | 20 點 |
標準授權 | 3761 x 2126 px | JPG | 22 點 |
標準授權 | 6649 x 3759 px | JPG | 23 點 |
標準授權 | 9403 x 5316 px | TIF | 39 點 |
進階授權 | 6649 x 3759 px | JPG | 88 點 |
進階授權 | 6649 x 3759 px | JPG | 88 點 |
進階授權 | 6649 x 3759 px | JPG | 88 點 |