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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 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 open, with 10-40 spikelets; bristles persistent
....3 Inflorescence relatively congested, mostly with (1-) 2-20 spikelets; bristles more or less caducous
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