| 释义 |
〔siphonostele〕A type of stele in which the vascular cylinder surrounds a pith, as in the stem of the sunflower.管状中心柱：一种围绕木髓血管圆柱体的中柱，如向阳花的茎中〔newel〕A vertical support at the center of a circular staircase.螺旋楼梯中柱：环行楼梯中间的垂直支撑〔protostele〕A stele that has a solid core of vascular tissue.原生中柱：一种有管状组织的实心中柱 |