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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 54

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51. the widest intervals between the leaves next below. In the case of crowded leaves we can, by a very simple calculation, ascertain the angle of divergence, and thus determine the primitive spiral - for example, a stem bearing a series of cycles of eight leaves moderately separated on three turns of the spiral, the cycle will be easily recognized, and the expression of the angel of divergence will be 3/8.
 
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