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Key to Carex, [26ff] Section 23a Hymenochlaenae: section Hymenochlaenae (the "Longirostres" group)

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1 Perigynia several-nerved, the beak much shorter than the body; basal sheath not conspicuously fibrous
1 Perigynia 2-ribbed (otherwise nearly nerveless), the beak about as long as the body; basal sheath conspicuously fibrous