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Key to Bolboschoenus

Cyperaceae

Bolboschoenus

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1 Ventral summit of leaf sheaths truncate or concave, the nerves destined for the leaf margins diverging gradually
1 Ventral summit of leaf sheaths convex, the nerves destined for the leaf margins diverging abruptly, making a nearly right-angle bend.
  2 Bristles mostly equaling to surpassing the distinctly trigonous achene
  2 Bristles shorter than to equaling the lenticular or plano-convex achene.
    3 Inflorescence relatively congested, mostly with (1-) 2-20 spikelets; bristles more or less caducous