Scientific NameRottboellia cochinchinensis
Other Common Names:
Synonyms (former Scientific Names):
This weed is an upright grass that can reach approximately 9 feet tall.
The leaves of Itchgrass are approximately 4 to 20 inches long and 1.5 to 7.5 inches wide. The leaves have stiff hairs on both sides of the leaves. The ligule is hairy and around a tenth of an inch long.
Itchgrass can be identified by its long, stiff hairs on the sheath, presence of prop roots, roots used for support, and seed heads that are cylindrical and jointed.
Flower Seed Head
The seedhead is a raceme that is cylindrical and jointed. It ranges from 2 to 6 inches in length.
The seed is a tan caryopsis, a dry singular fruit, that breaks apart with the rachis.
Itchgrass is mainly a weed of pastures and roadsides. It is also listed as a Federal Noxious Weed.
Leaf Hair on Upper Surface
hairs from base to tip
rolled in bud
Mature Leaf Width
less than 5 mm,
6 to 15 mm,
more than 15 mm
flat or oval
less than 1 mm,