Dahlia UK: /ÃËdeêliÃâ¢/ or US: /ÃËdeêljÃâ¢, ÃËdÃâÃÂl-, ÃËdæljÃâ¢/[3] is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico and Central America. A member of the Asteraceae formerly Compositae family of dicotyledonous plants, its garden relatives thus 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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進階授權 | 4608 x 3456 px | JPG | 88 點 |
進階授權 | 4608 x 3456 px | JPG | 88 點 |