dahlia
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The dahlia's great variety in flower form and color results from the crossing of primarily two species. All dahlias are native to Mexico. In 1789, botanical explorers collected native dahlia species that had 1- to 2-inch flowers, a single set of petals and a central disk. The overall effect was similar to common sunflowers. Grown together, these native species naturally hybridized and produced flowers with many more ray flowers and colors. By the late 1800s, intensive breeding had developed most of the various flower forms and colors. Currently, there are nearly 2,000 named varieties in the world.
Information from
http://www.garden.org/subchannels/flowers/bulbs?q=show&id=309
Information from
http://www.garden.org/subchannels/flowers/bulbs?q=show&id=309
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