A. fatua: annual; stems erect, glabrous, 2-3 feet high; panicle loose, of large spikelets, hanging fiom filiform pedicels of unequal length, arranged in alternate bunches along the main axis; awn twice as long as the spikelet, twisted at the base, abruptly bent about the middle. - Haver. - A common weed of cultivation. Fl. June, July.
A. pratensis: stems erect, 1-1 1/2 foot high; leaves scabrous; panicle slightly compound or reduced to a simple raceme, the spikelets erect, 3-4-flowered, glabrous, shining; awn twice the length of the glumes. - Meadows and limestone pastures. Fl July.