Cyperus alternifolius is a perennial sedge in the family Cyperaceae that prefers consistently wet or moist soil. Native to Africa and the Arabian Peninsula, it is often used at pond edges, in water gardens and as an indoor plant. It grows in full sun to partial shade and flowers from June to September.

Umbrella plant (Cyperus alternifolius) suits pond edges and indoor containers, preferring wet to moist soil and flowering June to September.

https://en.wikipedia.org/wiki/Cyperus_alternifolius

Cyperus is a large genus of about 700 species of sedges, distributed throughout all continents in both tropical and temperate regions.

Cyperus alternifolius

Umbrella plant | Cyperus alternifolius

Cyperus longus is a perennial sedge reaching about 1.2 m, noted for a sweet, aromatic scent. It produces upright stems suited to damp ground and margins of shallow water. Flowering occurs from June to September. Plant in full sun in sandy, loamy or clay soils that remain moist to wet.

Sweet galingale (Cyperus longus) is a perennial sedge for pond margins and wet gardens that flowers June to September and prefers full sun.

https://en.wikipedia.org/wiki/Cyperus_longus

Cyperus longus

Sweet galingale | Cyperus longus

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