Common Name: St. Augustinegrass
Species: Stenotaphrum secundatum (Walt.) Kuntze
Bayer Code: STPSE

St. Augustinegrass is a warm-season grass with medium density and medium to dark green color. Of all the warm season grasses, it is the least cold tolerant and has the coarsest leaf texture. St. Augustinegrass grows best in warm, humid areas that are not exposed to long periods of cold weather. In fact, its lack of cold tolerance is the major limiting factor in determining its use in North Carolina. Centipedegrass can often be confused with St. Augustinegrass. However, centipedegrass has alternating leaves at the nodes whereas St. Augustinegrass has opposite leaves at the nodes. Centipedegrass also has a more pointed, slenderer leaf blade than St. Augustinegrass. Both leaf blades are V-shaped in cross section, but that of St. Augustinegrass has a more obviously boat-shaped tip.
St Augustinegrass
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St. Augustinegrass seedhead
St. Augustinegrass seedhead
St. Augustinegrass seedhead
St. Augustinegrass sheath and collar, folded vernation
Seedhead / Flower spikeseedhead a thick spike with spikelets imbedded along the sides
Vernation Type foldedleaves folded in the bud
Ligule Type fringe of hairsshort fringe of hairs, 0.01 inches (0.3 mm) long
Growth Season / Life Cycle warm season turf 
Auricle Type absent 
Leaf Blade Tip Shape boat shaped OR bluntnot hairy
Leaf Blade Width medium, 0.1 - 0.2 in OR broad, greater than 0.2 in0.16 - 0.4 inches (4 - 10 mm) wide
Stolon Presence presentstout
Rhizome Presence absent 
Collar Type continuousnot hairy, constricted
Sheath Margin opensheath is slightly hairy along edges and toward top
Sheath Type flattenedsharply creased, loose