THE VARIOUS CROP OR CULTURE PLANTS 267 



the shores of the Mediterranean. The cabbage group, 

 which includes besides the head cabbage, the cauli- 

 flower, the kohlrabi, the Swede turnip, and the collard 

 and rapeseed (called wild turnip in California), is found 

 in the slender form all the way from Europe to Siberia. 

 And when the seeds of any of these are made to grow 

 in uncultivated ground, they soon become like the 

 wild form. The tomato and the potato are growing 

 wild in Chile, and have spread over the world from 

 there. Wild forms of our cherries, plums, apricots, 

 and peaches are still found growing wild in Persia and 

 Armenia. And so with many others. 



To show how much the wild forms of plants may be 

 changed by long cultivation, during which more or less 

 selection of kinds specially suited to particular pur- 

 poses has doubtless been practiced, we may take the 

 various forms of cabbage now being cultivated. Fig- 

 ures 156 and 157 show the most important of these 

 forms. 



In figure 156 we see the wild original cabbage plant, 

 now growing in rock crevices on the south coast of Eng- 

 land. Toward the right we see how a low-growing 

 plant has been gradually developed into a tree-like form 

 called the Georgia collard, figured from a photograph 

 of a California-grown plant. The Jersey kale, next to it, 

 is doubtless the. form from which the collard has been 

 made by selection in America. Next in height is the 

 Brussels sprout plant (figure 157), with small cabbage 



