plantladylin said:Does Gallant Soldier (Galinsoga parviflora) grow in Illinois?
Yes, but is not as common there as G. ciliata according to this Illinois wildflower page:
http://www.illinoiswildflowers...
(Note they give G. ciliata as a synonym for G. quadriradiata).
According my field guide G. parviflora has nearly hairless stems and has shorter rays than G. ciliata. The link above gives some other differentiating features.
