316 J. H. MAIDEN. 



Habit — Tate defines two habits of growth, viz: — trees, 

 and shrubby, stocky trees, to which he applies the ver- 

 nacular names of gums and mallees respectively, names 

 well understood in Australia. He points out that in young 

 plants of Bucalypts there is a large inflation of the base of 

 the stem, either at the surface or just below the surface 

 of the soil. In gums (E. rostrata, leucooeylon, viminalis, 

 etc.) this is eventually outgrown, but in the mallees (in- 

 crassata, uncinata, etc.) it persists, and increases in size 

 proportionately with the development of the branches 

 which are emitted from it— in the mallee this rudely globose 

 bole is partly subterranean. "The umbrella-like disposition 

 of the foliage of the taller mallees may be largely incidental 

 to overcrowding, though it would seem to be an inherited 

 character, as it is fairly pronounced in them when they 

 are distinctly separated from one another." This classifi- 

 cation is chiefly of practical use in Professor Tate's own 

 State (South Australia) and in Western Australia. 



It is however, very difficult to group the species accord- 

 ing to habit. Some are dwarf in their typical forms, but 

 under different circumstances they take on a larger growth. 

 Then, speaking generally, such species as are found in 

 damp situations in good soil are umbrageous trees ; such for 

 example are stellulata, aggregata, Macarthuri, but this 

 character is largely a matter of environment. Then some 

 species, e.g., viminalis, have a more or less drooping habit 

 as a rule, but this species is often nearly erect in less con- 

 genial soil. And, further, to show variation in habit, we 

 have only to point to the Eucalyptus plantations of Cali- 

 fornia and the South of France where the species are 

 cultivated almost out of recognition. 



Bark— Mueller (Journ. Linn. Soc, ill., 99, 1858) arranged 

 the genus in the following six groups in respect to their 

 barks. With the additional information we have obtained 



