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Grindelia

1. Teeth of leaves with prolonged spiny tips; phyllaries lacking resinous dots.

G. ciliata

1. Teeth of leaves merely acute; phyllaries strongly resinous dotted.

G. squarrosa

All species found in Grindelia

Grindelia ciliataGOLDENWEED 
Grindelia squarrosaGUMWEED 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 30, 2017. http://michiganflora.net/genus.aspx?id=Grindelia.