65 
No. 52. 
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Eucalyptus sideroxylon, a. Cunn, 
The Mugga; a Red Ironbark. 
(Natural Order MYRTACE^E.) 
Botanical description.— Genus Eucalyptus. (See p. 33, Part IT.). 
Botanical description.— Species E. sideroxylon , A. Cunn. 
Following is the earliest record I can find of this species:— 
At the base of the range of hills at Mount Maude some tolerable fair specimens of the Western 
Ironbark, Eucalyptus sideroxylon, were noticed, being easily distinguished from its congeners by its 
extreme rugged, furrowed bark, containing, like others of the Eucalypti, a strong astringent gum.— 
(A. Cunningham’s MS. Journal, under date 19th May, 1817.) 
Oxley’s Expedition was then in latitude 33° 25' and longitude 147° 10', i.e., 
about midway between Condobolin and Wyalong West. Some of these specimens 
were distributed with Cunningham’s name. 
The next reference I can find is : — 
6th October, 1846 (near Mount Pluto), .... and among the larger forest trees was a 
Eucalyptus, allied to, but probably distinct from, the E. sideroxylon, A. Cunn., p. 339. —(Mitchell’s Trop. 
Journ. Austral., 339.) 
In the list of plants collected by Mitchell’s Expedition, at p. 437 of his work, 
this plant, referred to at p. 339, is given as E. sideroxylon without any qualification. 
I have seen the specimens in question, and they are what we know as E. sideroxylon, 
A. Cunn. 
Then Mueller described a species, under the name of E. leucoxylon, in the 
following words :—“Arboreous : 
Leaves.—Alternate, somewhat shining, narrow lanceolate, subfalcate, tapering into a long uncinate 
acumen, veined and furnished with pellucid dots ; umbels axillary, generally three-flowered, 
with a thin peduncle. 
Lid. —Conico-heinispherical, acuminate. 
Tube of the calyx.— Semiovate, somewhat longer than the lid. 
Fruits. —Semiovate, hardly contracted at the orifice; the valves of the capsule inclosed. 
Seeds .—Blackish clathrate. 
Tn grassy plains from the Avoca to St. Vincent’s and Spencer’s Gulf. 
This is the “ White Gum Tree” of the South Australian Colonists.”— {Trans. 
Victorian Inst., i, 33 [1855]). 
A 
