1. Disk cylindrical, longer than the rays; rays less than 2 (–2.5) cm long; pappus of 1–2 tiny teeth.
R. columnifera
1. Disk hemispherical (or even nearly spherical) to short-cylindrical, much shorter than the rays; rays ca. 2.5–3.5 (–4.5) cm long; pappus absent.
R. pinnata
All species found in Ratibida
Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 1, 2021. https://michiganflora.net/genus.aspx?id=Ratibida.