Iron Weed

Vernonia baldwinii

Habitat: Tall Grass Prairie

Seasons: Late summer through winter

Active Chemical Ingredient

Linoleic-acid

https://en.wikipedia.org/wiki/Linoleic-acid

Use of specimen: A tea made from the seeds can be taken to relieve stomach complications, help soothe a sore throat, and help diminish pain from toothache   

Source: http://www.ayurvedicnaturalhomeremedies.com/medicinal-uses-of-iron-weed-or-wild-cumin/