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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 Cyperus, Key A: Key to subgenus Lipocarpha

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1 Inflorescence terminal, the bracts 2-3, deflexed to ascending; spikes (1-) 2-5, each 2-10 (-12) mm long; achenes narrowly obovoid, 3.3-5× as long as wide; anthers ca. 0.25 mm long, or longer; [section Lipocarpha]
  2 Scale apex (the outer 0.2-0.3 mm) excurved, acuminate; stigmas 2; anthers ca. 0.25 mm long
  2 Scale apex straight to incurved; stigmas 3; anthers ca. 0.5 mm long
1 Inflorescence appearing lateral, the bracts 1-2 (-3), the longest held vertical and appearing as a continuation of the culm; spikes 1-2 (-3), each 1-5 (-8) mm long; achenes obovoid or ellipsoid, 1.5-2.5× as long as wide; anthers 0.1-0.2 mm long.
    3 Stigmas 3; outer scales ca. 2 mm long, the greenish midrib projecting as a long, excurved cusp; plants relatively robust, culms 5-30 cm tall, ca. 0.7 mm thick; [rare waif, FL]; [section Rikliella]
    3 Stigmas 2; outer scales 0.5-1.6 mm long, acute to acuminate, incurved to slightly excurved; plants diminutive, culms 2-15 (-20) mm tall, 0.3-0.5 mm thick; [collectively widespread]; [section Neohemicarpha]
      4 Outer scale 0.5-1 mm long; inner scale bifid, to 0.2 mm long or absent; [widespread in our region]
      4 Outer scale 0.9-1.6 mm long; inner scale oblong, 0.5-0.8 long; [IL and LA westwards].
        5 Outer scale widest about at mid-length, acuminate, excurved; inner scale usually veinless (rarely with 2-4 reddish veins)
        5 Outer scale widest above mid-length, mostly acute, incurved; inner scale with 2-4 reddish veins
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