too abstruse / obtuse to be useful - please rewrite so that high school seniors can readily grasp it
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'''Endogen''' is a [[plant]] having a primary stem with vascular bundles that are not arranged in concentric circles and that have older stems lacking distinct wood and bark layers.
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An '''endogen''' is a [[plant]] having a primary stem with vascular bundles that are not arranged in concentric circles and that have older stems lacking distinct wood and bark layers.