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Arnica

1. Lower leaves cordate.

A. cordifolia

1. Lower leaves lanceolate to narrowly ovate.

A. lonchophylla

All species found in Arnica

Arnica cordifoliaHEART-LEAVED ARNICA 
Arnica lonchophyllaLONGLEAF ARNICA 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 23, 2017. http://michiganflora.net/genus.aspx?id=Arnica.