How do pollen produce flowers?

Flowers can produce a huge amount of pollen. American Polyan Ambrosia produces 1500 million pollen grains per hour, i.e. 18,000 million corn per day. This plant is the main cause of hay fever. Bad news for people hit by it: only one square mile of land, overgrown with ambergris, the air raises 8 tons of pollen a week.

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