endarch


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endarch

[′en‚därk]
(botany)
Formed outward from the center, referring to xylem or its development.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Ten endarch vascular bundles of the external system are distributed
are endarch and others mesarch; some are amphicribral and others are
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).
Protoxylem of stem/axis: 0 = none; 1 = centrarch; 2 = mesarch; 3 = endarch; 4 = exarch.
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).