Helianthus Giganteus, commonly known as giant sunflower, is a species of sunflower that belongs to the family Asteraceae. This flower is known for its tall stem and large flower head that produces edible seeds. Some of the common synonyms used to refer to Helianthus Giganteus include giant sunflower, tall sunflower, swamp sunflower, and rough sunflower. The name 'Swamp Sunflower' is due to the flowers' tendency to grow in wet and swampy areas. It is called the "Rough Sunflower" because of its tough foliage. The scientific name, Helianthus Giganteus, is derived from Greek words 'helios' which means sun and 'anthos' which means flower.