Knotroot Bristlegrass, Yellow Bristlegrass, Marsh Bristlegrass

Setaria parviflora (Poir.) Kerguélen

Poaceae (Grass Family)

▲emerging inflorescence

mature plants ▲▼

stem bases ▲

inflorescences▲▼

 

close up of inflorescence ▲

collar, ligule region ▲

Knotroot Bristlegrass, Yellow Bristlegrass:  (not in Weeds of the Great Plains, nor Weeds of the Northeast)

·         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