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Key to Rhynchospora, Key A: beaksedges with tubercles 3-23 mm long
[subgenus Haplostylae; sections Longirostres and Polycephalae]

Cyperaceae

Rhynchospora

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(c) Smith, Jacob M.
(c) Bradley, Keith
(c) Smith, Jacob M.
1 Spikelets arranged in globose or subglobose clusters; tubercle 3-5 mm; leaf blades 2-8 mm wide.
(c) Smith, Jacob M.
(c) Smith, Jacob M.
  2 Spikelets arranged in subglobose, umbel-like clusters; achene margins crimped; tubercle narrowly conic, 3-4 mm long (of similar length to achene body); plants not rhizomatous; [section Longirostres]
(c) Ward, Scott G
(c) Ward, Scott G
  2 Spikelets arranged in tightly globose clusters; achene margins not crimped; tubercle linear, 4-6 mm (longer than achene body); plants rhizomatous; [section Polycephalae]
(c) Wright, Janet - CC-BY-NC, permission granted to NCBG
(c) Sorrie, Bruce A. - CC-BY
1 Spikelets in > 4 paniculate or corymbose clusters; tubercle 10-23 mm long; leaf blades 6-20 mm wide; [section Longirostres].
(c) Wright, Janet - CC-BY-NC, permission granted to NCBG
(c) Ward, Scott G
    3 Longest bristles longer than or equaling the achene.
(c) Fleming, Gary P.
      4 Plants cespitose; primary clusters with 10-50 (rarely 7 or fewer) densely clustered spikelets; achene (4.5-) 5-6 mm long
(c) Horn, Jay
(c) Keim, Mary - CC-BY-NC-SA, permission granted to NCBG
      4 Plants rhizomatous; primary clusters with 1-6 loosely clustered spikelets; achene (3.5-) 4.0-4.8 mm long.
(c) Ward, Scott G
        5 Bristles 2-8 mm long, the central bristle longest on one face, shortest or absent on the other
(c) Ward, Scott G
        5 Bristles 7-12 mm long, essentially of equal length