DeVries divided these new forms into five groups: 



1. Re'rograde Varieties: 



(1) 0. laevijolia — smooth-leaved; strong and fertile 



constant. 



(2) 0. nanella — dwarf and constant. 



(3) 0. brevistylis — short-styled, few seeds formed, 

 vigorous aud constant. 



2. Progressive Elementary Species: 



(1) 0. gigas — giant; stout; constant. 



(2) 0. rubrinervis — red- veined and with red streaks 

 fruit; constant. 



3. Progressive Elementary Species, but weakly: 



(1) 0. albida — white, narrow leaves, delicate; con- 



stant. 



(2) 0. oblonga — narrow leaved and constant. 



4. Incomplete forms: 



(1) 0. lata — pistillate, low, dense. 



5. Inconstant forms: 



(1) 0. scintillans, dwarf and inconstant, reverting 



to new forms. 



(2) 0. elliptica — narrow-leaved and inconstant. 

 Bateson and others suggest that some of DeVries ' mu- 

 tants of Oe. lamarckiana may be due to some sort of hybri- 

 dization behavior. The new characters may be the re- 

 appearance of characters brought in by hybridization, by 

 some process akin to Mendelian segregation. 



Other suggestive reasons for believing in its possible 

 hybrid origin are: 



Davis has produced a new Oenothera by crossing 

 Oe. biennis with Oefranciscana, and has named it Oe. neo- 

 lamarckiana. In its systematic characters it cannot be dis- 

 tinguished from lamarckiana, and its behavior in breeding is 

 very similar. 



