This grass spikelet from the middle Cretaceous is about 100 million years old, preserved in amber as the earliest fossil ever found of the evolution of grass, and is covered on its tip by the ...

long, flat or V-shaped, keeled below, and somewhat rough or smooth above. Barnyard grass does not have a ligule or auricles. The spikelets are green to purple, numerous, and located on branches of the ...