Vol. XXVlll."! c^^ ToHX, Notes on the " River White Gum." 70 



to be the ' River White Gum ' of New South Wales — E. 

 radiate, Sieber This seems to be one of those eastern forms of 

 vegetation which are not found further to the westward than 

 the Mitchell River, though this tree individually does not ex- 

 tend beyond the Tambo River. I have observed it at an 

 elevation of 50 feet at Jimmie's Point backwater, 200 feet at 

 the Tambo Crossing, 300 feet at the Murrendel River and at 

 Wangrabell, on the Genoa." 



Howitt now goes on to discuss variety / — a form which has 

 since been raised to specific rank, and is now known as E. 

 regnans. He says : — " This eucalypt, though possessing a 

 specific title, belongs to E. amygdalina, and is less removed 

 from the typical form than the varieties which I have desig- 

 nated d and e.'' 



R. T. Baker and H. G. Smith * describe the " River White 

 Gum," E. radiata, Sieber, as follows ; — " A fairly tall tree. It 

 has a hard, black bark on the lower part of the trunk, but 

 smooth in the upper portion of the tree. Sucker leaves thin, 

 sessile, or almost perfoliate, much resembling those of 

 amygdalina, opposite, narrow, about 3 to 4 inches long, mar- 

 ginal vein slightly removed from the edges. Mature leaves 

 lanceolate, narrow, generally about 6 inches long ; venation not 

 prominent ; intramarginal vein removed from the edge, lateral 

 veins oblique, spreading. Oil glands more numerous than in 

 that of any other species. Flowers very numerous — up to 30 

 on axillary peduncles. Calyx turbinate, small, tapering to a 

 long filiform pedicel ; operculum obtuse ; ovary flat-topped. 

 Fruit small, pilular, 2 (rarely 3) lines in diameter, rim thin, 

 contracted. 



" Habitat. — New South Wales, on river- banks and mountain 

 ranges of the coast district, but preferring banks of creeks." 



They also make the following remarks : — " We are quite in 

 accord with Sieber, the author o' the species, that this eucalypt 

 is worthy of specific rank. He was familiar with the tree in the 

 field, and so did not confound it with amygdalina, as has been 

 done by recent botanists. Dr. Woolls, who also studied these 

 two trees in nature, remarks (' Flora of Aust.,' p. 239) • — ' No 

 one who has had an opportunity of examining both trees in a 

 living state would suppose them to be allied, as they vary so 

 much from each other in bark and habit.' To this we should 

 like to add also that they differ in timber, number of flowers 

 in the umbels, shape of leaves, shape of fruits, and constituents 

 of the oil. On these grounds we differ from those authors 

 who synonymize the species with E. amygdalina." 



J. H. Maiden f discusses the synonyms of E. amygdalina, 



* " Research on the Eucalypts," p. 185. 



■)• " Critical Revision of the Genus Eucalyptus," vol. i., part 6, p. 153. 



