Cyperus iria | 1000 SEEDS - Rice flat sedge | Umbrella sedge These seeds grow into Cyperus iria, a striking aquatic plant known for its lush, grass-like foliage. Gardeners appreciate Cyperus iria for its elegant appearance and ability to create natural, serene landscapes.Cyperus iria produces slender stems topped with delicate, umbrella-like clusters of fine leaves.