It is a one-year or two-year grassland plant in southern Europe and in Nanjing, China. It has a chilly and cold climate. It smokes a penis in the early summer and leaves to eat. It can eat, eat, cook or make soup. The diarrhea tastes a little bitter, green, can be fried or mixed, is a good food to go to the fire, and also has antibacteria, deheating, inflammation, sight, etc. It has been widely appreciated for its effectiveness in heat alleviation。