462 



GENERAL MORPHOLOGY OF PLANTS 



rosettes. These were different from any known species of 

 evening primrose. One form (O, Icevifolia) with smooth leaves 

 was found growing in a group a little distance from the main 

 body of O. lamarckiana, where it was reproducing itself. The 

 different forms found growing wild were transplanted to the 



Fig. 414. 



Large plant. Lamarck's primrose (CEnothera lamarckiana) ; small plant at the right, dwarf 

 primrose (CEnothera nanella), a mutant from Lamarck's primrose. (After MacDougall.) 



garden. Seeds from O. lamarckiana were sown in the garden in 

 large numbers. Some of these seeds developed forms exactly 

 like those new ones found in the field. After several years of 

 study and experimentation several distinct mutants of O. lamarck- 

 iana were obtained in pure culture in the garden, which were 

 new forms or elementary species as they are called. 



When close pollinated these forms bred true, except that 

 some of them threw off mutants also; the forms thrown off by 



