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Key to Poaceae, Key K: grasses with 1 floret and unawned lemmas

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Show caption*© Aidan Campos 1 Spikelets 18-32 mm long; [tribe Poeae]  Avena

1 Spikelets 0.7-10.8 mm long.

Show caption*© Eric Lamb, some rights reserved (CC BY), uploaded by Eric Lamb   2 Spikelets clearly orbiculate, the glumes keeled  Beckmannia syzigachne

2 Spikelets variously shaped, sometimes rounded but not clearly orbiculate, the glumes keeled or not.

3 Florets rigid, shining; glumes and lemmas rounded in ×-section, not keeled; spikelets 2.5-5 mm long; [tribe Poeae]  Milium

3 Florets soft, papery; glumes and lemmas keeled in ×-section; spikelets 0.7-10.8 mm long.

4 Florets with a conspicuous tuft of hairs on the callus; [tribe Zoysieae; subtribe Sporobolinae]  Calamovilfa

4 Florets not conspicuously hairy on the callus.

5 Lemma 1-veined; ligule of hairs; grain becoming mucilaginous when wet; [tribe Zoysieae; subtribe Sporobolinae]  Sporobolus

5 Lemma 1-5-veined; ligule a membrane (the summit sometimes ciliolate); grain not becoming mucilaginous when wet.

6 Lemmas faintly 5-veined; lower glume longer than the lemma; palea much shorter than the lemma (or absent); [tribe Poeae]  Agrostis

6 Lemmas strongly 3-veined; lower glume shorter than (rarely equaling) the lemma; palea about equaling the lemma; [tribe Cynodonteae; subtribe Muhlenbergiinae]  Muhlenbergia