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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 55

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52. This is the arrangement in the case of the Sun-Flower. The leaves in the head becoming so crowded into a rosette that the spiral becomes a very close one, comparable to a watch spring of which the coils contract in approaching the axis. Further, if the inner end of this spring represents the top of the spiral, and its outer extremity the base it is obvious that on this depressed
 
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