DR. F. MUELLER ON AUSTRALIAN ACACIA. 115 
names, adding his manuscript ones for the purposé of reference, 
and retaining his characters as completing our previous knowledge 
ofthe plants. The following general observations by Dr. Mueller 
were contained in the letter to Sir W. Hooker, which accompanied „ 
this paper.—G. В.) 
The Uninerves, although comprising such a large array of species 
in the southern latitudes of Australia, are exceedingly rare within 
the tropics. Indeed, only two desert plants of wide range, A. 
Sentis (doubtfully combined by Mr. Bentham with 4. decora) and 
4. salicina, Ldl., accompany some of their usual companions as 
far as North Australia; and only a solitary new one, allied to 
A. elliptica, was observed in the Gregorian journey. ‘Those of this 
group, which extend to subtropical latitudes in East Australia, are 
for the greater part identical with southern forms (for instance, 
Acacia falcata, penninervis, suaveolens, oleifolia) ; still А. podalyri- 
Jolia and A. prominens, from Moreton Bay and Wide Bay, are 
not to be found in Australia Felix. The plant referred by Mr. 
Bentham, in the ‘Linnea,’ to the last-mentioned species, is as- 
suredly distinct, and probably А. lunata, Sieber. А new species, 
of this section, allied to .4. vestita, seems to be restricted to the 
warmer parts of the east coast, while my southern collections 
. exhibit three other unknown kinds. I feel very reluctant to com- 
bine our common <A. reclinata with what I assumed to be A. 
leprosa, which is with us a rare species, occurring towards the 
sources of the Yarra: Unfortunately, many kinds ripen the fruits 
so rarely, that one of the best specific characters for distinction in 
this genus also remains often beyond avail 24. imbricata, from 
Spencer's Gulf, belongs to the Uninerves, not to A. conferta 
amongst Brunioidee, which I noticed near Wide Bay. The 
habitat * Ponindi," mentioned under A. verniciffora in the ‘ Lin- 
nea,’ vol. xxvi. belongs to A. dodoneifolia, Bauer having, no doubt, 
collected it on the very spot, near Port Lincoln. A. salicina is 
remarkable for the scarlet arillus which surrounds the seed,—a 
character in which, as far as I know, only 4. melanozylon partici- 
pates. Acacia gladiiformis and A. hakeoides seem combinable. 
Nearly related to them is 4. notabilis, a desert plant of Spencer's 
Gulf and Lake Torrens, but scarcely referable to A. obtusata, 
Sieb., а mountain-plant of East Australia. I venture also to 
deviate from Mr. Bentham's opinion when he unites 4. microcarpa 
.. (singular for the smallness of its fruit) with А. bucifolia; for the 
. figure in Sir W. Hooker's ‘ Icones Plantarum’ seems to exhibit 
Something very different. 
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