Four new species of Hypolytrum Rich. (Cyperaceae) of section Hypolytrum, from Isla del Coco (Costa Rica) and Brazil are described and illustrated. Hypolytrum amplissimum sp. nova is a robust species with lax synflorescence and common in the lowlands of Isla del Coco. Hypolytrum espiritosantense sp. nova, H. glomerulatum sp. nova and H. lucennoi sp. nova occur in Northeastern – Southeastern Brazil. They are robust species, with synflorescences somewhat condensed to lax, paraclades patent to reflexed, and the spikes can be in terminal clusters.
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Alves et al. (2002) studied this question.