叶柄长至8厘米，扁平，具条纹
雄蕊4个，近于等长，包于盔内，花丝扁平，无毛
Engler, Bot. Jahrb. 29: 556. 1900; Dunn in Notes Bot. Gard. Edinburgh 6: 188. 1915; Kudo in Mem. Fac. Sci. Agr. Taihoku Univ. 2: 185-1929; C. Y. Wu in Act. Phytotax. Sin. 8 (1) : 46. 1959; Hsuan in ibid. 10 (1) : 54. 1965
叶三角状卵圆形或卵圆状长圆形，长6.5-14厘米，宽4-8厘米，先端长渐尖，基部截状阔楔形至急狭尖，边缘为具胼胝尖的圆齿状粗锯齿