IPM1007, Revised November 2009
Summer annual grass
A summer annual with large round, smooth sheaths that are often bent at the nodes. A primary identifying characteristic of this grass weed is the "zigzagged" growth pattern it takes on due to bending at the nodes. Seedlings are uniquely different from the mature plants in that the seedlings have many hairs on the lower surface of the leaf blades, but these hairs disappear from plants with maturity. Mature plants have leaves that are rolled in the shoot, 15 to 20 mm wide, 4 to 20 inches long, and auricles are absent. The ligule is a fringe of hairs reaching 2 to 3 mm in length and is often fused at the base. The seedhead is a wide, spreading panicle that develops a purplish tint when mature.
Order publications online at http://extension.missouri.edu/explore/shop/ or call toll-free 800-292-0969.