1.24.97
The Virtual WeedPatch
id.html
grassid.html
Grass Weed Identification ToolKit
Grass weed morphology and ID is often much harder than broadleaf weed
ID. This is because superficially all grasses look the same. Get close,
and you will notice many features that will guide your ID.
LEAF MORHOLOGY
This is a generic grass leaf in cross-section. Notice the prominent
midrib.
LIGULE & COLLAR REGION
The different parts of the collar region, where the leaf blade joins the
culm (stem), can be a very revealing area for grass ID.
Below (clockwise): Upper right: blade; middle right: collar region; lower
right: sheath; lower left: auricles; middle left: ligule
Below (Clockwise): lower right, sheath; lower left (2 arrows), auricles;
collar; mid-left, ligule; leaf blade; upper left, midrib; upper right, leaf
margin; mid-right, collar margin
Ligule types:
Membranous ligule 
No ligule 
Hairy ligule 
SHEATH
No auricles: 
Auricles: 
Sheath split with overlapping margins: 
Sheath united: 
STEMS
Round 
Oblong 
Flat 
Triangular (diagnostic for sedges) 
INFLORESCENCE
SEED
(optional information; not required)
From top: awn; lemmas; glumes
From top: palea; lemma; rachilla
From top: stamen; stigma; ovary; lodicule
Top view: grass floral schematic diagram
From top: hilum; endosperm; coleoptile; plumule; mesocotyl; epiblast;
scutellum; scutellum cleft; coleorhiza
