Deschampsia

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  D. danthonioides

  1a. Plants annual; leaves few, short, the blades less than 33% as tall as the reproductive stem
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  1b. Plants perennial; leaves relatively more numerous, longer, 33–50% as tall as the reproductive stem
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    D. elongata

    2a. Panicle very narrow, with appressed branches; both glumes with 3 nerves
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    2b. Panicle open, with ascending to spreading branches; first, and sometimes also the second, glume with 1 nerve
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      D. flexuosa

      3a. Leaf blades involute, 1–2 mm wide; ligule 1–2.5 mm long; lemmas minutely scabrous-pubescent, bearing a conspicuously bent awn that evidently exceeds the lemmas by 1–3 mm [Fig. 208]; palea not bifid at the apex
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      3b. Leaf blades flat or conduplicate, 1–5 mm wide; ligule usually 3–12 mm long; lemmas glabrous, bearing a ± straight awn that is shorter than to slightly exceeding the lemmas; palea bifid at the apex
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        D. cespitosa

        4a. Stems 65–170 cm tall, 2–6 mm thick near the base; lower stem leaves 15–50 cm long, with ligules (2–) 5–10 (–12) mm long; panicles 15–45 cm tall
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        D. anadyrensis

        4b. Stems 7–75 cm tall, 1–2.5 mm thick near the base; lower stem leaves 1–8 cm long, with ligules (2–) 3–4 (–7) mm long; panicles 2–22 cm tall

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