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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