Annual panicle grass.
A. fatua is widely distributed in North America and Australia (A. fatua and A. sterilis), in Europe mostly A. fatua, in Africa mostly A. sterilis. It is widespread in summer wheat production and due to a very high growth rate it greatly reduces yield. Because its comparable to wheat, it is very competitive; only 5 plants/ha (2 plants/a.) are tolerated on wheat seed propagation fields. Infested wheat seeds are difficult tot clean
Dense panicle, spikelets with 0-1 awn, florets (seeds) do not readily separate and shed.
The youngest leaf is rolled, leaf blades colored dark green, up to 40 cm (15.75 inch) and 4 - 18 mm (0.16 - 0.71 inch) wide.
Erect, plant height from 40 to 150 cm (15.75 - 59.05 inch).
The membraneous ligule is up to 6 mm (0.24 inch) long, often irregularly toothed (dentate, fringed). No auricles. Sheaths smooth or slightly hairy, especially in younger plants. Leaves are left screwed.