DR. STANLEY FLEGLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY DR. STANLEY FLEGLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Pollen of Common Ragweed (Ambrosia artemisiifolia) shown on the surface of the sac-like anther. Each anther contains tens of thousands of pollen grains and one plant can produce up to one billion grains. Wind dispersed pollen is called anemophilous. SEM X5000 (based on 4 x 5 ).
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