1. Leaf blades coarsely toothed or shallowly lobed, triangular-ovate, all but the upper ones cordate, with main veins ± palmate; phyllaries not keeled.
1. Leaf blades entire or nearly so, unlobed, elliptic, with several prominent longitudinal veins; phyllaries prominently keeled.
All species found in Arnoglossum
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. April 21, 2019. https://www.michiganflora.net/genus.aspx?id=Arnoglossum.