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Support the Flora of the Southeastern US

2024 has been a banner year for making the best flora we can imagine. We've created:
With financial support from people like you, we are aiming even higher in 2025. Together we can accomplish all this: Vote on our 2025 priorities
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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

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

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image of plant
Show caption*© Aidan Campos
1 Spikelets 18-32 mm long; [tribe Poeae]
1 Spikelets 0.7-10.8 mm long.
image of plant
Show caption*© Eric Lamb, some rights reserved (CC BY), uploaded by Eric Lamb
  2 Spikelets clearly orbiculate, the glumes keeled
  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]
    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]
      4 Florets not conspicuously hairy on the callus.
        5 Lemma 1-veined; ligule of hairs; grain becoming mucilaginous when wet; [tribe Zoysieae; subtribe Sporobolinae]
        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]
          6 Lemmas strongly 3-veined; lower glume shorter than (rarely equaling) the lemma; palea about equaling the lemma; [tribe Cynodonteae; subtribe Muhlenbergiinae]