1. Inflorescences with 20–40 (–55) spikes; spikes detaching from the rachis at maturity.
1. Inflorescences with 1–4 spikes; spikes persisting on the rachis.
2. Spikes 15–40 mm long, with ca. 17–50 spikelets; plants in small clumps.
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.
All species found in Bouteloua
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 6, 2019. https://michiganflora.net/genus.aspx?id=Bouteloua.