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Rush-like herbs, with equitant leaves sheathing the base of a naked scape, which is terminated by a head of perfect 3-androus flowers, with extrorse anthers, glumaceous calyx, and a regular colored corolla; the 3-valved mostly 1-celled capsule containing several or many orthotropous seeds with a minute embryo at the apex of fleshy albumen.

Perianth small, of 6 equal persistent glumaceous segments; flowers perfect; ovary compound.

Grass-like or rush-like herbs, with small flowers, a regular and hypogynous persistent perianth of 6 similar glumaceous sepals, 6 or rarely 3 stamens with 2-celled anthers, a single short style, 3 filiform hairy stigmas, and an ovary either 3-celled or 1-celled with 3 parietal placentæ, forming a loculicidal 3-valved capsule.

Mayaceæ, 537 Perianth wholly glumaceous, of 6 similar divisions.

Juncaceæ, 539 Perianth partly glumaceous or chaff-like; flowers in very dense heads.