7Metcalfe C R, Chalk L. Anatomy of the Dicotyledons Vol. Ⅱ [M].2nd ed. London: Clarendon Press, Oxford, 1983.64-65.
8范建平 吴学明 李有忠 etal.A study on the anatomical characteristics of leaf laminea of 5 species of Salix growing in Qinghai Plateau [J].青海师范大学学报:自然科学版,1995,2:50-54.