270 
These two varieties are figured and fully described in Part xv of my " Critical 
Revision of the genus Eucalyptus," to which my readers are referred for further 
information in regard to a somewhat protean species. 
Affinities. This is dealt with at some length, though not finally, at page 173, 
Part xv, of the same work. 
Botanical Name. Eucalyptus, already explained (see Part II, p. 34); 
oleosa, Latin, oil-bearing. In spite of its name, it is not an important source of 
Eucalyptus oil. For further particulars see " A Research on the Eicalypts" (Baker 
and Smith). 
Vernacular Names. "Red Mallee" because of the colour of the timber. 
Sometimes called " Smooth-barked Mallee," but this is by no means sufficiently 
characteristic; indeed I have sometimes known it to be called " Rough-barked Mallee," 
but it is usually smooth rather than rough. 
The variety ylauca Maiden, is on the sand-hills at Ooldea, S.A., stated by 
Mr. Henry Deane to be called " Water Mallee," because its roots yield water to the 
blacks (compare Part LI, p. 14). It is, with other trees, known as " Blaekbutt " 
on the Eastern Gold-fields of Western Australia. 
The variety longicornis F.v.M. is known in Western Australia as " Morrel," and 
in some districts as " Poot." 
Aboriginal Names. I know of none which can be certainly attributed to 
this species. 
Synonyms. #. socialis F.v.M., E. laurifolia Behr, E. iurbinata Behr et F.v.M. 
These are forms found in South Australia. For details, which need not be repeated 
here, see my " Critical Revision of the genus Eucalyptus," Part xv. 
Leaves. Normally the juvenile leaves are broad or broadish, but they ctry 
in width, so that in some exceptional instances they may be narrower. 
Flowers. The operculum is usually pointed-tapering, but sometimes roundcu. 
and even almost hemispherical. Occasionally the buds almost assume the " egg-in- 
egg-cup " chape, reminding one of E. salubris (the Gimlet gum of Western 
Australia) and a few other species, in this respect. 
Fruit. A common character is the awl-shaped tips of the valves, which are 
'/ell exsert as a rule. 
Bark. Its trunk has roughish bark at the butt, but the upper portion ana 
the branches are smooth. 
Timber. Colour of a reddish brown, with the reddish colour predominating 
more or less. It is durable, but it is usually so small that it is but of limited use except 
for such local purposes as posts and rajls arid fuel, 
