'Sedge' in the Bible

And when she could no longer hide him, she took for him an ark of reeds, and plastered it with resin and with pitch, and put the child in it, and laid it in the sedge on the bank of the river.

And the daughter of Pharaoh went down to bathe in the river; and her maids went along by the river's side. And she saw the ark in the midst of the sedge, and sent her handmaid and fetched it.