BOTANY OF SWAN RIVER. 311 



from Swan River. I may observe, however, that the 

 number is considerable, and that their specific characters 

 have been recently published.^ 



The MyriacecB of Swan River belong chiefly to Mela- 

 leuca, Beaufortia, Calotliamnus, Calythrix, Billottia,^ and 

 .Eucalyptus. 



Of Eucalyptus the only species in the collection had been 

 first found in Captain Plinders's voyage at King George's 

 Sound, on the shores of which it was the only useful tao 

 timber tree, though there of very moderate size. I have 

 named it Eucalyptus calophylla. 



Mr. Eraser describes it as forming, on the banks of the 

 Swan, a large forest tree, and erroneously refers it to An- 

 gophora, a genus which is limited to the east coast of New 

 Holland. Other species of Eucalyptus, forming the timber 

 of the country, are mentioned in the report, and considered 

 to be some of the common gum-trees of Port Jackson, 

 from which, however, I have no doubt they will prove 

 to be distinct ; for I am acquainted with no species of this 

 genus common even to the east and south coasts of New 

 Holland. 



I shall conclude with a remark relating equally to the 

 genus Eucalyptus and to the Leafless Acacice, several species 

 of which are found in the collection. This observation I 

 have formerly made in the Appendix to Captain Flinders's 

 Voyage in the following terms^ : — "These two genera are 

 not only the most widely diffused, but by far the most ex- 

 tensive in Terra Australis, about 100 of each having 

 already been observed ; and if taken together, and con- 

 sidered with respect to the mass of vegetable matter they 

 contain, calculated from the size as well as the number of 

 individuals, are perhaps nearly equal to all the other plants 

 of that country. They agree very generally also, though 

 belonging to very different famihes, in a part of their 

 economy, which contributes somewhat to the peculiar 



' Supp. I, Prodr. Flor. Nov. Holl. 



' A genus distinct from Leptospermum, to which the few species Litheito 

 published, namely, B. margiaala^Jlexmsa, and linearifolia, have Deen referred. 

 •■' {Aitle, p. 63.) 



