Saccharine content in leaves of each cultivar has an increasing trend, which is consistent with that ofstems, reaching peak value in blooming stage, and declining to the bottom in consequence.

• 各品种叶片中糖含量呈明显的增加趋势，各品种茎中糖含量变化规律较为一致，均是先不断的升高，在开花期达到峰值，而后下降至最低。