1. Plants tall (over 0.5 m), erect; leaves mostly acute, with stalked glands (at least beneath).
1. Plants low (up to ca. 0.5 m), ± spreading and several-stemmed or -branched; leaves mostly obtuse (but mucronate), eglandular.
All species found in Heterotheca
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 27, 2020. https://michiganflora.net/genus.aspx?id=Heterotheca.