endarch


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endarch

[′en‚därk]
(botany)
Formed outward from the center, referring to xylem or its development.
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Ten endarch vascular bundles of the external system are distributed
In the base of the hypocotyl occurs the change of the exarch, typical condition of the root to the endarch one, and the arrangement of xylem and phloem assumes the collateral position (Figure 2D and E).
Examples of such structural synapomorphies for the extant Cycadales are girdling leaf traces, an inverted omega pattern of vascular bundle arrangement in petiole and cataphyll bases, protoxylem poles changing from endarch in the stem to exarch in the leaf traces, a primary thickening meristem, a contractile taproot, and ageotropic, coralloid, lateral roots (Stevenson, 1990b; Norstog & Nicholls, 1998).