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1. Inflorescences with 20–40 (–55) spikes; spikes detaching from the rachis at maturity.

B. curtipendula

1. Inflorescences with 1–4 spikes; spikes persisting on the rachis.

2. Spikes 1540 mm long, with ca. 1750 spikelets; plants in small clumps.

B. gracilis

2. Spikes 0.6–1.5 mm long, with ca. 5–10 spikelets (male plants), or spikelets concealed within a ± globular, bur-like structure (female plants); plants colonial from stolons.

B. dactyloides

All species found in Bouteloua

Bouteloua curtipendulaGRAMA GRASS, SIDE-OATS GRAMA 
Bouteloua dactyloidesBUFFALO GRASS 
Bouteloua gracilisBLUE GRAMA GRASS 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. September 25, 2022. https://michiganflora.net/genus.aspx?id=Bouteloua.