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.
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
No auricles: Auricles:
Sheath split with overlapping margins:
Triangular (diagnostic for sedges)
(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