What is the botanical name of the kidney used to bind corn stalks in rural areas in the 1970s and 1980s? Like sorghum, but thinner than sorghum, with drooping ears!

There are generally two kinds of red and green, especially when I was a child, that is, reed millet, the stem is slightly thinner than sorghum and corn. The scientific name of sugar sorghum is also called reed, sweet stalk, sweet sorghum and sorghum sugarcane. The tender stems are dotted with several tender leaves, such as millet and reed millet, which are a variety of sorghum and look similar to sorghum. It is impossible to tell which one is sorghum.