50.0 MB (2.7 MB compressed)
5120 x 3413 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
MARTIN OEGGERLI / SCIENCE PHOTO LIBRARY MARTIN OEGGERLI / SCIENCE PHOTO LIBRARY
Ragweed (Ambrosia sp.) pollen grains (yellow) sticking to an anther, scanning electron micrograph (SEM). Pollen grains are reproductive structures produced by the male parts of flowering plants. Ragweed releases 1.6 million pollen grains per hour, which are highly allergic and a major contributor to hayfever.
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