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The sun flower as a type of flowering plants by Anne B. Jewett, 1890

The Sun Flower as a Type of Flowering Plants by Anne B. Jewett, 1890, Page 23

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20. of the Mature Xylem or Phloem proceeds from originally uniform cells, alike in all particulars. Such cells capable of constant development and differentiation make up, whenever found in connection with a fibro-vacular bundle. The cells of the cambium divide ? 4th The [underlined] Xylem [/underlined] consists of the vessels, easily recognized by their large cavity: the walls are thick, and they have no protoplasmic cell
 
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