Setaria parviflora (Poir.) Kerguélen
Family : Poaceae
Longevity : Perennial
Origin : Native
Season : Warm
Knotroot bristlegrass is a native Texas grass that is common in the South Texas Plains and Edwards Plateau. It grows best in moist soils, often in ditches along roadsides. The stems of the plant grow from knotty rhizomes, giving it its name, and can measure 35 inches in height. The blades and the stems of the plant are often a purplish color. As the seedheads mature, they tend to turn yellow. Several bristles can be seen below each seed. The smooth leaf blades are flat and can be up to a foot in length. Knotroot bristlegrass flowers year-round as long as it has enough moisture and the right temperature. It has fair wildlife and livestock economic value.