FLOWERING IN EARLY JULY TO THE LATTER PART OF SEPTEMBER GRAINS TRICOLPORATE, OCCASIONALLY TETRACOLPORATE. THESE POWDER-LIKE MICROSPORES (MALE FERTILIZING ELEMENTS) PRODUCED BY THE AUTHORS OF FLOWERING PLANTS THAT ARE CARRIED BY WIND OR INSECTS AN PLAY A MAJOR ROLE IN THE ETIOLOGY OF HAY FEVER AND SOME CASES OF ASTHMA. This is a scanning electron micrograph (SEM) that has been hand colored. The months, July thru September relate to conditions in USA. POLLEN, CANADA GOLDENROD Solidago canadensis x1500
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