👉 Synangium is a genus of flowering plants in the family Apiaceae, commonly known as the dandelion or grass dandelion. It belongs to the monocot family, which includes about 100 genera with more than 3,500 species. The synangiums are perennial herbs that have a single, white flower called a seedhead and produce seeds in the spring. They typically grow between 2-4 feet tall and have smooth, flat leaves.