Bouteloua

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  1a. Branches of panicle each with 20–130 spikelets [Fig. 193], persistent, the branch axis terminated by progressively reduced spikelets, not prolonged beyond spikelets; disarticulation above the glumes
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    B. simplex

    2a. Plants annual, without rhizomes or stolons; glumes glabrous, sometimes scabrous distally
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    B. gracilis

    2b. Plants perennial, often with rhizomes or stolons; upper glumes often with pustulose-based hairs on the midvein
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  1b. Branches of panicle each with (1–) 2–8 (–15) spikelets, deciduous, the branch axis not terminated by reduced florets, the axis prolonged beyond the base of the uppermost spikelet as a bristle 3–6 mm long; disarticulation occurring at base of branch
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    B. curtipendula

    3a. Inflorescence with (12–) 30–80 branches [Fig. 192]; central awn of lowest lemma not flanked by lateral lobes (i.e., the lemma with 3 total lobes)
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    3b. Inflorescence with (3–) 6–12 branches; central awn of lowest lemma arising from between two membranous lobes 0.5–1.5 mm long (i.e., the lemma with 5 total lobes; the lateral lobes sometimes shorter in B. repens)
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      B. rigidiseta

      4a. Apex of panicle branch axis prominently bifid or trifid; upper glume bilobed, the awn emerging from the sinus; lower glumes 3–4 mm long
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      B. repens

      4b. Apex of panicle branch axis entire; upper glume acute at apex, unawned or with a short awn-tip; lower glumes 4–7 mm long

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