Collateral or bicollateral vascular bundle, developmental pith and medullary ray are obvious.

髓部发达，髓射线明显。

The pith of this stemlike stele appears rather strongly like collenchyma tissue.

茎状柱髓显得颇强健，像厚角组。

Plenty of laticiferous tubes were included in roots, stems and leaves.Intraxylary phloem formed around the pith.

髓外围形成一环内生韧皮部，这些结构特征使罗布麻能更好适应干旱、盐碱恶劣环境。

Ground meristem The central region of the apical meristem from which the ground tissues of pith, cortex, medullary rays, and mesophyll differentiate. In root meristem it is also called periblem.

位于顶端分生组部，髓、皮层、髓射线以及叶肉这些基本组均是由基本分生组分化而成。根部分生组也称为皮层原。