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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 17

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14. well marked masses of thick-walled tissue. the portion between them being thin-walled and transparent. On examining the latter carefully however you can see that the external part of it has thicker walls and is less regularly arranged than the central portion, and therefore must be distinguished from it. We have, then, four portions of the bundle which, taken in succession
 
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