You probably never paid any attention to the flowers on grass.
Grasses do flower, although the flowers are so small you
can hardly see them. Timothy (Phleum pratense),
shown here, is actually rather colourful at this time of year,
if you look really closely.
Timothy is a favourite hay crop (usually harvested before
it blooms), but it also grows wild all by itself in open
spaces in many parts of the world.
Next stop: Bird-foot Trefoil