small teeth, height 50 cm, 2 feet

Where is this growing? Asteraceae? Cyperaceae? It's looks kind of grassy, but not quite. I guess you haven't seen it bloom?

on the road in the village, I know that, but I don't know his name
I have not seen the flowers,

This is merely a guess. The serrated margin reminded me of the Pampas Grass that likes to cut my skin.
Maybe you have some type of tripsacum? Maybe T. dactyloides/fakahatchee grass or something similar?

It's not cut, no sharp, tripsacum cut like corn