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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 52

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49. not all of them, and (b) by the entry of fresh bundles from the leaves, (usually in the case of the sun-Flower, three bundles enter from the petiole of each leaf into the vascular ring, The studies of the bundles as illustrated, were made after the leaves began to exhibite their alternate arrangement. The cross section of the earlier phases of the plant show the bundles, six in
 
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