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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 49

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46. grows older, single cells of the rows forming the young bundle change into permanent cells of definite form; from these points of origin the transformation of the pro-cambium - cells into permanent cells, as seen in the transverse section of the bundle, advances until the cells are all changed into permanent cells, except a single inner layer, this cell-layer remains in a condition
 
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