Abstract:This paper deals with the relationship between the photosynthesis and the illumination in ten species.Main results were obtained as follows:1. From the value of net photosynthetic rate and light respiratory rate it shows that ten species belong to C3 herb.2. According to light saturation point of net photosynthesis and gross photosynthesis in the leaf of plant under maximum light intensity of a clear day(110 KLx), ten species can be divided into three groups: (1)having no light saturation point in both gros...