BY J. H. MAIDEN. 493 



3. The reputed parents must, of course, flower at the same 

 tnne, and it must be borne in mind that there is considerable 

 irregularity in the flowering periods of most species. 



4. A hybrid possesses characters intermediate (not always 

 strictly intermediate) between its two reputed parents. 



5. Where species are closely related it is obviously more 

 difficult to detect hybridism than where the parents have 

 characters which readily contrast. 



E. AMYGDALINA X CORIACEA. 



E. vitellina Naudin (see these Proceedings, 1903, p. 900) and 

 E. vitrea R. T. Baker, are, in my opinion, closely related (perhaps 

 identical) hybrids between E. amygdalina and E. coriacea. 

 Naudin looked upon his species as a hybrid (and even suggested 

 the above two parents). I have dealt with this form, and also 

 the evidence for looking upon E. vitrea as a hybrid in my 

 'Critical Revision Genus Eucalyptus' (Part vi. pp. 164-1 66). 



E. OBLiQUA L'Herit. var. alpina Maiden. 



(E. delegaiensis R. T. Baker); E.ohliqua x coriacea (?). 



It is possible that this interesting form may be a hybrid 

 between E. ohliqua and E. coriacea^ but I am confronted with 

 the difficulty that usually this form is not met with at so low an 

 elevation as E. obliqua, as it appears to " succeed " E. ohliqua in 

 higher elevations. A reply to this, of course, would be that the 

 hybrid once established it could have gradually become accli- 

 matised to higher elevations. 



E. Baileyana F.v.M. 



I have evidence which tends to show that this species is pro- 

 bably a hybrid between E. trachyphloia F.v.M. (or E. corymhosa 

 Sm.) and E. Planchoniana F.v.M. I am dealing with the matter 

 in my ' Critical Revision,' so will not take up space here. The 

 leaves and flowers have been described from a dififerent tree from 

 that carrying the characteristic fruits. 



