QUACKGRASS, Agropyron repens
(L.) Beauv. 1, spike; 2, stems, leaves, and inflorescence;
3, auricle and ligule; 4, seed; 5, spikelets; 6,
buds on rhizome; 7, new shoots; 8, origin of new shoots;
9, rhizomes and roots. Perennial, reproducing by seed and
underground rhizomes. Rhizomes vary from 2 to 8 inches (5 to 20
cm) in depth, depending on soil type and soil treatment. Individual rhizomes
live only two summers and one winter but new ones develop from buds in
the axils of reduced leaves. Roots arise only at nodes. Stems 1-1/2
to 3 feet (45 to 90 cm) tall, with smooth culms and 3 to 6 joints. Leaves
have auricles, ligule 1/32 inch (0.8 mm) long, hairy lower sheaths, upper
sheaths smooth or nearly so. Spike has 3 to 7 short-awned florets
in a spikelet. Found in open waste places, pastures, and most cropped
areas. It requires special control methods because of its weedy habits.
Although it is considered a primary noxious weed in most states, it can
often be used for pasture or hay.