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Wild Lettuce

A comparison between this and the large leaved, compact, salad plant of our gardens shows the wonders of adaptation which cultivation works. This wild lettuce is known in some places as the "compass plant" because of the fact that its leaves, instead of fanning out in all directions from the stalk, point always north and south-an adaptation, no doubt, to protect the plant from the heat of the mid-day sun.

Wild Lettuce

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 4