Growing Stem
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This illustration shows the longitudinal section of the tip of a growing stem: e, epidermis extending over surface of the entire tip; a, formative region; b, upper portion of the zone of elongation; c, cortex; x, cells of the central region that by further growth form the vascular bundles; l, first appearance of the leaves.
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Cellular BotanySource
Carlton C. Curtis, Nature and Development of Plants (New York: Henry Holt Company) 98
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