Pogostemon Stellatus (Stellata) also was known as Eusteralis Stellata Octopus. It's an aquatic perennial herb from Southeast Asia. When growing in the aquarium, it required a rich based nutrient substrate as well as CO2 and high lighting.
Sold as a bunched plant. Fresh cut, 3+ stems with a lead weight.
Pictures are not the actual plants you will receive, but a sample representation.