Knotroot Bristlegrass, Yellow Bristlegrass, Marsh Bristlegrass
Setaria parviflora (Poir.) Kerguélen
Poaceae (Grass Family)
mature plants ▲▼
▲▼ mature plants
stem bases ▲
inflorescences▲▼
▲emerging inflorescence
close up of inflorescence ▲
▲ ▼ ligule and collar region
▲ short, knot-like rhizomes
Knotroot Bristlegrass, Yellow Bristlegrass:
· Warm-season creeping perennial grass in the same genus as the annual foxtails (Setaria)
· Grows 12-36” tall and produces rhizomes that have knotted appearance (hence name)
· Similar in appearance to yellow foxtail, with stiff, upright, yellowish to reddish-yellow inflorescences on upright stems
· Leaf blades often more blue-green than yellow foxtail, and can be flat or with a fold at the midvein (younger leaves)
· Have few or no hairs at the base of the leaf blades (yellow foxtail has long white hairs at base of leaf blade)
· Stem bases/sheaths may be purplish or reddish