'Rush' in the Bible

Therefore Jehovah will cut off from Israel head and tail, palm-branch and rush, in one day.

Ah, the uproar of many peoples, that roar like the roaring of the seas; and the rushing of nations, that rush like the rushing of mighty waters!

The nations shall rush like the rushing of many waters: but he shall rebuke them, and they shall flee far off, and shall be chased as the chaff of the mountains before the wind, and like the whirling dust before the storm.

Neither shall there be for Egypt any work, which head or tail, palm-branch or rush, may do.

Is such the fast that I have chosen? the day for a man to afflict his soul? Is it to bow down his head as a rush, and to spread sackcloth and ashes under him? wilt thou call this a fast, and an acceptable day to Jehovah?