The seedhead is a true spike with the spikelets attached directly to a single terminal stem. The flowers of annual ryegrass have prominent awns in comparison to the awnless flowers of perennial ryegrass. An additional distinctive characteristic of annual ryegrass is the long, pointed, clawlike auricles . It is found throughout the United States, where it is introduced through seeding. Persists in lawn height turf under dry conditions.
Field sandbur is a warm-season annual grass found throughout the United States.
It grows most readily in sandy or coarse textured soils. The spikelets are borne on a terminal spike and are enclosed in a sharp spiny bur containing one to three seeds. Field sandbur, like puncture vine, presents a hazard to man and animals due to the painful spikes on the bur. More common in warm humid regions. Stinkgrass is widely distributed throughout the United States.