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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 Aira

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1 Panicle dense and spike-like, 0.5-4.1 cm long, 0.3-0.7 cm wide, the branches short and appressed to ascending
1 Panicle open, 1.2-13.5 cm long, 1.5-10 cm wide, the branches elongate, diffusely spreading or ascending.
..2 Pedicels usually 1-2× as long as the spikelets; lemma of both the lower floret and the upper floret with an awn 2-4 mm long
..2 Pedicels usually 2-8× as long as the spikelets; lemma of upper floret with an awn 1.5-2.5 mm long, lemma of the lower floret awnless or with a minute awn < 1 mm long
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