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I made the following comment:—“ The blacks had but one name for this, the Ironbark Box, and 
the Ironbark ( siderophloia ), but Caley saw that they were different. Caley’s surmise at hybridisation in 
this case is marvellously shrewd.” (See Proc. Linn. Soc. N. S. Wales, 1901, p. 339.) 
It is only proper to emphasise Caley’s discovery. He is undoubtedly the first man who wrote down 
a statement that hybridisation takes place in Eucalypts, which discovery is therefore a century old ! 
Little is known in regard to Caley’s scientific work, as he published little; and botanists do not clearly 
know what became of most of his specimens. Careful examination of his labels might show other important 
observations. At present I would submit that the discovery to which I have already alluded is a very 
valuable one, and he should be credited with it. 
The matter of natural hybrids amongst our native plants is often difficult to 
prove, particularly amongst our Eucalypts, hut that natural hybridisation does 
occur in the genus has now passed the stage of conjecture. I am accumulating 
evidence on the subject, and intend to figure a number of forms in another work. 
Botanical Name. — Eucalyptus, already explained (see Part II, p. 34) ; 
JBoormani, in honour of John Luke Boorman, Collector, Botanic Gardens, Sydney, 
who in regard to this and other species, has prosecuted inquiries in an intelligent 
and painstaking manner. 
Vernacular Names. —The name “ Black Box ” seems to be most generally 
in use for this species ; the even better name of “ Ironbark Box ” (which certainly 
indicates its affinities) is nearly as frequently in use. At Lue it is also called “ She 
Ironbark,” its difference from the ordinary Ironbarks being thus recognised. 
Aboriginal Name. —“ Burryagro,” was the name for this tree amongst the 
aborigines of the Counties of Cumberland and Camden, in common with the Broad¬ 
leaved Ironbark {E. siderophloia). I have already shown that Caley discriminated 
between the two trees which the aborigines designated by the same name. 
Timber. —Already referred to in the botanical description. 
The late Mr. Vallins, who lived near Cabramatta, had the highest opinion of 
it, and ornamental rustic structures which he erected of branches of this tree of 
quite small diameter lasted as posts (a severe test for timber) in the Botanic Gardens 
and elsewhere for very many years. 
Unfortunately, it is not abundant, and it has usually been used or sold as 
Ironbark, for which it is an honest substitute. 
Size. —A large tree. 
Habitat. —Bankstown and Cabramatta districts, thence across country to 
Penrith. It has also been found at Luc, on the Mudgee line. 
So far, it is not known out of New South Wales, and over not very great 
stretches of country in that State. But the similarity it presents to Eucalyptus 
siderophloia on the one hand and to E. hemiphloia on the other leads me to believe 
that its range is very much more extensive than we at present know it to be. 
