Grasslike wetland plant (4)
(Other definitions for rush that I've seen before include "Perform hurriedly; marsh plant" , "Move fast or attack suddenly" , "Hurry - marsh plant" , "Be too hasty or too fast" , "High" .)
(Other definitions for reed that I've seen before include "Film director" , "Type of musical instrument" , "Tall perennial grass" , "It grows in water or marshy land" , "Riverside grass" .)