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Key to Puccinellia

Poaceae

Puccinellia

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1 Lemmas 3.0-4.5 mm long; spikelets 5-11-flowered
1 Lemmas 1.5-2.5 mm long; spikelets 2-6-flowered.
  2 Inflorescence diffuse, the lower branches with spikelets restricted to the distal portions; lower inflorescence branches spreading horizontal to deflexed at maturity; lemma 1.5-2.1 mm long, the midnerve not reaching the apex
  2 Inflorescence compact, the lower branches bearing spikelets nearly to the base; lower inflorescence branches ascending at maturity; lemma 2.0-2.5 mm long, the midnerve reaching the apex, and often excurrent as a mucro