A new guineagrass cultivar “Natsuyutaka” was released in Japan in 1988 by the Kyushu National Agricultural Experiment Station. Natsuyutaka originated from the seeds of a local ecotype of guineagrass collected in east Africa. Natsuyutaka is perennial tetraploid having a habit lf growing semi-erect. It is a medium-late maturing cultivar, i.e. 20-30 days longer than cultivar Gatton. Its plant height is slightly taller than Gatton and Petrie green panic. Its reproduction is completely based on apomixis. The growth in the early stage is not as fast as Natsukaze, being the same as Gatton and Petrie. Regrowth after cutting is however excellent. The field tests show that Natsuyutaka is much higher than Natsukaze, Gatton and Petrie in annual yield under a perennial condition. The quality as a feeding stuff, such as protein and digestability, is similar of slightly lower than that of Gatton and Petrie. It grows well under a soil condition of pH 4.8 to 6.7, but not under alkaline soils. Natsuyutaka is expected to be widely grown to grasslands as a perennial grass in the sub-tropics of Japan. It is suited for soilage and grazing as well.