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Pellaea

1. Rachis of blade glabrous, rarely with a few scattered long, curly hairs.

P. glabella

1. Rachis of blade clearly finely short-hairy.

P. atropurpurea

All species found in Pellaea

Pellaea atropurpureaPURPLE CLIFF-BRAKE 
Pellaea glabellaSMOOTH CLIFF-BRAKE 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://www.michiganflora.net/genus.aspx?id=Pellaea.