75§ 



THE 



knowledge is concerned, has no exact duplicate in the native 

 flora of any region, and two probabilities are suggested as to its 

 origin : It may have been a native of a restricted range in " Vir- 

 ginia " in which it has been exterminated by agricultural opera- 

 tions, and hence cannot be found at the present time : or it may 

 have arisen by some such sudden, and abrupt, discontinous vari- 

 ation, as that by which deVries' mutants came into existence, 

 from (/•;. biennis in the gardens, at Padua, Altdorf or else- 

 where: at least no intermediate forms are known." 



Only eleven specimens of hybrid seedlings derived from 

 (Rnothcra lata were brought to the adult stage, in my cultures 

 and of these but two conformed to the type of (E. lata, the 

 remainder being the O. lamarckiana form. CE. lata does not 

 perfect its stamens but it is capable of being pollinated from the 

 parent. The offspring followed the laws governing parent and 

 mutant hybrids, which with deVries were found to consist of 

 187; to 207; of the mutant type and the remainder of the par- 

 ent. My own results agree with this. It is clear that this form 

 would not have survived beyond the season of its appearance as 



>r and physiological properties are 

 listinguishable. In following out 

 : during the eighteen months over 

 xtended it became evident that it 

 parent in its earlier, and also in its 

 it in the full rosette stage. The 



