Plant Vein
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“Diagram indicating the succession of the conducting tissues of a vein from the base toward the apex. a, border parenchyma; b, companion cells; c, sieve tubes; d, undivided mother cells of companion cells and sieve tubes; e, tracheal elements.” -Stevens, 1916
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Cellular BotanySource
William Chase Stevens Plant Anatomy (Philadelphia, PA: P. Blakiston, 1916)
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