This paper presents a layered polynomial texture (LPT) to represent grass based on its complex geometric structure and diffuses material. LPT is a 5D texture, and its element contains a group of polynomial parameters, to fit the pixels of multiple layers with various lighting directions, and to calculate the actual color in rendering stage. Grass is represented with three LPTs along known view directions. The LPT synthesis method based on wang tile is presented to create tiles, which are mapped onto ground to form grassland. The grassland is rendered in the dynamic lighting condition. Experimental results show that the LPT storage is smaller, and computational cost is lower. Furthermore, LPT could be extended to represent trees with dynamic shadow.