494 NOTES ON HYBRIDISATION IN THE GENUS EUCALYPTUS, 



E. CoNSiDENEANA Maiden. 



In describing this form (these Proceedings, 1904, p. 475) I have 

 expressed the opinion that it may be a hybrid between E. 

 piperita and E. Siheriana. In expressing this opinion I desire 

 to make a note inculcating caution. It is sometimes difl5cult to 

 properly assign the use of names, for the fact is all species have 

 probably arrived at their present development largely by means 

 of hybridism. The following will illustrate what I mean. 



E. Consldeneana probably has E. piperita and E. Sieheriana 

 blood in its veins. We therefore might perhaps explain its 

 position by saying that it is a hybrid between these two. But 

 if E. Consideneana had been described firsts it perhaps would not 

 have occurred to botanists to describe, say, E. piperita as a 

 hybrid of it. 



Mr. Cambage and I found E. Consideneana in full bloom (Nov. 

 1904) and not rare near the 40-mile post on the road from Sydney, 

 4^ miles east of Springwopd. 



The Ironbark Boxes. 



The Ironbarks and the Boxes appear to hybridise with facility. 

 Following are some combinations of this class : — 



E. BooRMANi Deane & Maiden. 

 {E. siderophloia x hemiphloia). 



See a paper (these Proceedings, xxv. Ill, 1900) 'On apparent 

 hybridisation between E. siderophloia Benth,, and E. hemiphloia 

 F.V.M.' I desire to say that I have no doubt in my own mind 

 as to E. Boormani being a hybrid between the species named. 



Here I would draw attention to my paper ' George Caley, 

 Botanical Collector in New South Wales, 1800-1810' in the 

 Agric. Gazette, N. S. Wales (Oct. 1903, p. 990). Caley gave the 

 aboriginal name for E. hemiphloia as "Barilgora" or "Berigora," 

 and " Derrobarry " and also " Burryagro '* for E. siderophloia. 

 Attached to a specimen of E. Boormani Caley makes the follow- 

 ing statement — " ' Burryagro.' A hybrid between ' Barilgora ' 

 and ' Derrobarry ' ! " 



