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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 42

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39. already been differentiated as dermatogen, in Phanerogams, But they may originate also in much older parts of the tissue systems of which have already become further differentiated, because in such cases the epidermis long remains generative; e.g. - produces Stomata and allows of cell division. Hairs are always striking by different in their form from the leaves and lateral shoots of the same
 
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