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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 22

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19. formative layer of the whole stem. the cells in this are arranged in radial rows with thin cellulose walls, and contain protoplasmic contents. The form of the individual cell varies from oblong to square, In passing from the cambium to the Phloem or Xylem, the form of the cell is modified in the direction of the cells already differentiated. From this we can plainly see that the development
 
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