1. Pappus scales (of disk flowers) lacking an awn; ray flowers with pappus absent or vestigial; gland-tipped hairs of pedicels less than 0.5 mm long; teeth of leaf margin obscure, broadly rounded or little more than thickened bumps.
1. Pappus scales, or many of them, with a slender terminal awn distinguishable from the cilia; ray flowers with pappus well developed; gland-tipped hairs of pedicels mostly 0.5 mm or more long; teeth of leaf margins usually definite, acute in outline.
All species found in Galinsoga
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 15, 2017. http://www.michiganflora.net/genus.aspx?id=Galinsoga.