226 



THE PLANT WORLD 



O. versicolor and O. spitiosior (tasajo), with a puzzling 

 range of color in the flowers. Thus, some individuals will 

 be found which have bright crimson or reddish purple flowers 

 and others with light red; others with yellowish red, yellow 

 and greenish yellow, the shade also being reflected by the 



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Fig. S. Opuntia versicolor: maximum size. 



color of the stems, so that the color of the flower may be 

 predicted upon seeing the plant from a long distance. In 

 some instances two colors appear to be exhibited by a single 

 plant, but a closer examination generally shows that what 

 appears to be one plant is, in reality, two grown together at 

 the base. 



