Jepson eFlora
Key to families | Table of families and genera

Key to Bouteloua

View taxon page for Bouteloua

1. Annual

2. Spikelets 1–4 per inflorescence branch; branch axis prolonged beyond terminal spikelet node generally > 5 mm; inflorescence branches deciduous in fruit, spikelets falling with branch ..... B. aristidoides var. aristidoides

2' Spikelets > 6 per inflorescence branch; branch axis terminated by spikelet; inflorescence branches persistent, spikelet axis breaking between glumes and lower floret

3. Tip of lower floret lemma 2-lobed, central awn from sinus; base of middle or, if only 2 florets, upper floret hairy-tufted ..... B. barbata var. barbata

3' Tip of lower floret lemma tapered to central awn; base of upper floret glabrous ..... B. trifida (2)

1' Perennial herb — rhizomes or stolons sometimes present

4. Inflorescence branches 13–60, deciduous in fruit, spikelets falling with branch ..... B. curtipendula

4' Inflorescence branches < 8, persistent in fruit, spikelet axis breaking between glumes and lower floret

5. Lower stem internodes hairy; inflorescence branch axis slightly prolonged beyond terminal spikelet node ..... B. eriopoda

5' Lower stem internodes glabrous or minutely scabrous; inflorescence branch axis terminated by fertile or vestigial spikelet

6. Base of middle or, if only 2 florets, upper floret hairy-tufted; tip of lower floret lemma 2-lobed, central awn from sinus ..... B. gracilis

6' Base of upper floret glabrous; tip of lower floret lemma tapered to central awn ..... B. trifida (2)

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Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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