Short Ragweed
Short Ragweed is highly allergenic, and considered the greatest allergen of all pollens.
Short Ragweed. Each plant produces millions of grains of pollen over a season, and the plant is wind-pollinated.
Short Ragweed is a plant of concern in global warming because higher levels of carbon dioxide may increase pollen production.
Short Ragweed. On dry windy days, the pollen may travel many miles.
Short Ragweed. No area in the U.S. is ragweed pollen free. Ragweed was accidentally introduced to Europe during WWI; it thrived and has greatly spread since the 1950s.
Bluegrass
Curled (curly, yellow) dock
Whitetop or Hoary Cress
Brome grass
Foxtail grass
Johnson grass
Curlycup Gumweed
Goldenrod. The goldenrod is the state flower of the U.S. states of Kentucky and Nebraska.
Goldenrod. Due to their bright, golden yellow flower heads blooming in late summer, the goldenrod is often (falsely) blamed for causing hay fever in humans.
Goldenrod. The pollen causing most allergy problems in later summer is ragweed, blooming at the same time as the goldenrod, but is wind-pollinated.
Goldenrod pollen is too heavy and sticky to be blown far from the flowers, and is thus mainly pollinated by insects.
A Field of Goldenrod
Sunflower. Ragweeds (Ambrosia) are a genus of flowering plants from the sunflower family.
American Elm. There are 30-40 species of elm.
Ash tree
Ash tree. The wood is hard (a hardwood) and strong but elastic, extensively used for making tool handles and baseball bats.
Fall blooming elm
Catalpa tree
Praying Mantis
Mullein plant
