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Cenchrus

1. Involucre a spiny bur enclosing much or all of the spikelets, the whole readily disarticulating.

C. longispinus

1. Involucre of slender bristles ca. 2–4 cm long subtending but not concealing the spikelet.

C. purpurascens

All species found in Cenchrus

Cenchrus longispinusSANDBUR, SANDSPUR 
Cenchrus purpurascensFOUNTAINGRASS 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. April 23, 2019. https://michiganflora.net/genus.aspx?id=Cenchrus.