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Avena
See list of 3 species in this genus-
1a. Spikelets with predominantly 3 florets; lemmas pubescent with appressed, brown hairs
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1b. Spikelets with predominantly 2 florets; lemmas glabrous or scabrous, without brown hairs
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2a. Lemmas scabrous near apex, both of each spikelet with an awn; inflorescence secund
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2b. Lemmas glabrous, only the lower of each spikelet with an awn; inflorescence not secund
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Each photo represents one species in this genus.