Parsnip: Pastinaca sativa
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This plant attracts a great variety of insects. Unfortunately, it is invasive in the American Midwest and crowds out native species.
Ichneumon wasp nectaring at wild parsnip
Wild parsnip is an eye-catching weed that hails originally from Europe and Asia. Wild parsnip grows in large patches or as scattered plants along roadsides, in abandoned fields, on pastures, on restored prairies, and in disturbed open areas.

"There are chemicals in wild parsnip called psoralens (precisely, furocoumarins) that cause what dermatologists call "phyto-photo-dermatitis." That means an inflammation (itis) of the skin (derm) induced by a plant (phyto) with the help of sunlight (photo). When absorbed by skin, furocoumarins are energized by ultraviolet light (present during sunny and cloudy days) causing them to bind with nuclear DNA and cell membranes. This process destroys cells and skin tissue, though the reaction takes time to produce visible damage."
- From "Burned by Wild Parsnip" - Wisconsin Natural Resources Magazine

Wild parsnip: Pastinaca sativa
Tachinid fly
Wild parsnip: Pastinaca sativa
Scape moth
Wild parsnip: Pastinaca sativa
Sphecid wasp
Wild parsnip: Pastinaca sativa
Ladybeetle

Ichneumonidae

Soldier beetle
Insects LOVE this plant. I only know of one patch of these plants at the Winfield Mounds Forest Preserve, and I spend a lot of time there when the yellow weeds are in bloom. They attract almost every variety of insect in search of nectar and pollen. Here are pictures of just a few of the larger ones - I don't bother usually with small ants and tiny beetles, of which there are thousands competing for space at the trough.
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Common North American Flowers
A flower is the reproductive structure found in flowering plants (plants of the division Magnoliophyta, also called angiosperms). The flower contains the plant's reproductive organs, and its function is to produce seeds. After fertilization, portions of the flower develop into a fruit containing the seeds. 
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