Kusa are a form of grass-like plant on Rovaria. They are by far the most common form of life there.
Kusa are photosynthetic plants, converting carbon dioxide into oxygen and producing glucose. They are rather short, the tallest varieties being only 0.52-0.61 meters tall. They have blades similar to Terran grasses, but they are lined with a carbonate edge, which is rather sharp. They cannot harm animals merely tredding on it, but animals attempting to consume them tend to get cuts on the insides of their mouths. Like wheat, they reproduce by changing their blade into a stalk and growing seeds on the top. These are then spread by the wind.
They live on plains of Rovaria, and are the base of life there.