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榉树

榉树

  榉树(别名血榉、金丝榔、沙榔树、毛脉榉等)又名大叶榉,是榆科榉属的落叶乔木树种,属国家二级重点保护植物。在中国分布广泛,生长较慢,材质优良,是珍贵的硬叶阔叶树种。

  形态特征榉树乔木,高达30米,胸径达100厘米;树皮灰白色或褐灰色,呈不规则的片状剥落;当年生枝紫褐色或棕褐色,疏被短柔毛,后渐脱落;冬芽圆锥状卵形或椭圆状球形。叶薄纸质至厚纸质,大小形状变异很大,卵形、椭圆形或卵状披针形,长3-10厘米,宽1.5-5厘米,先端渐尖或尾状渐尖,基部有的稍 偏斜,圆形或浅心形,稀宽楔形,叶面绿,干后绿或深绿,稀暗褐色,稀带光泽,幼时疏生糙毛,后脱落变平滑,叶背浅绿,幼时被短柔毛,后脱落或仅沿主脉两侧残留有稀疏的柔毛,边缘有圆齿状锯齿,具短尖头,侧脉7-14对;叶柄粗短,长2-6毫米,被短柔毛;托叶膜质,紫褐色,披针形,长7-9毫米。雄花具极短的梗,径约3毫米,花被裂至中部,花被裂片6-7,不等大,外面被细毛,退化子房缺;雌花近无梗,径约1.5毫米,花被片4-5,外面被细毛,子房被细毛。

  核果几乎无梗,淡绿色,斜卵状圆锥形,上面偏斜,凹陷,直径2.5-3.5毫米,具背腹脊,网肋明显,表面被柔毛,具宿存的花被。花期4月,果期9-11月。

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