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endarch

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
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 outer part of the sarcotesta.
Axes showing endarch maturation and a sympodial vasculature have been classified as Cordaixylon, while those with mesarch leaf traces and a non-sympodial vasculature, as seen in the Joggins specimen (Fig.
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).
 
 
 
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