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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 53

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50. number, i.e. three from each of a pair of leaves. [underlined] Phyllotoxy [/underlined], - is the study of the distribution of the leaves upon the stem, and of the leaves which govern it. The general conclusion reached is, that leaves are distributed in a manner to economize space, and have a good exposure to light &c - - . and that this economy on the whole, results from the formation of leaves in the bud over
 
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