This giant is the one people talk about. You know it is in bloom when you see the yellow Canadian Goldenrod which grow along side it in bloom. The Goldenrod is often falsely blamed for the allergies. Here the male ragweed flowers are getting ready to spread their pollen (read allergens).
A closer view of the male inflorescence.
Here the tiny flowers can be seen.
These female flowers grow lower on the plant.
A lower female flower for the production of seeds.