SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Dahlia pollen grains. Dahlia is a genus of bushy, tuberous, perennial plants native to Mexico, Central America, and Colombia. The Aztecs gathered and cultivated the dahlia for food, ceremonies, as well as decorative purposes. The dahlia is named after Swedish botanist Anders Dahl. In Germany the dahlia was known during most of the 19th century as Georgia, being named after the naturalist Johann Gottlieb Georgi of St. Petersburg, Russia. The great variety of flowering dahlias results from them being octoploids, i.e., having eight sets of homologous chromosomes, whereas most plants have only two. Enhanced SEM. Image width: 150.6 micrometers. Magnification: 664x if the image is printed 10 cm wide.
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