* 
expanded vertically in the form of a simple rigid leaf, with the 
margins more or less thickened, and upon the upper edge may often 
be seen a gland, corresponding to that which is so frequent on the 
petiole of other Mimosez. This peculiar phyllodineous form of the 
leaf is almost confined to Australia, but has also been observed on 
many of the leaves of Acacia heterophylla from the Mauritius, and . 
also on a new species of Mimosa gathered by Dr. Pohl in the interior . 
of Brazil. 
The group of Acacias collected together by this character do not 
present, as far as hitherto observed, any peculiar modification in the 
flowers or fruit, and do not therefore constitute a good botanical sec- 
tion ; yet this conformation is so remarkable, and so easily observed, 
that it forms the most convenient primary division of the genus. The 
next subdivision has been derived from the inflorescence, the heads of 
flowers being sometimes elongated in the form of a spike, sometimes 
nearly globose; and the globe-flowered species have again been dis- 
tributed into two groups, according as the peduncles bear but one 
head, or a raceme of several heads. This latter character is not, 
however, so certain; many species, and amongst others the one now 
figured, have some of the peduncles simple, others bearing a raceme 
of several heads. When the pod is better known, it is probable that 
much more natural subdivisions may be framed from the modifications 
of that organ, in conjunction with those of the flower, the stipules, and 
perhaps the glands of the leaves. 
The new species now figured is a native of Swan River. It is 
nearly allied to the Acacia saligna of Labillardiere, but the leaves 
are much narrower, and the form of the calyx is very peculiar. The 
cultivated specimens are hitherto rather poor of flower, but, judging 
from the wild ones, they are likely to become as ornamental as the 
generality of the Australian species. G. B. 
INTRODUCTION; WHERE GROWN; CuLTuRE. First found in the 
colony of Swan River, by Mr. James Drummond; it was raised in 
the garden of Messrs. Rollisson of Tooting, from seeds transmitted by 
‘that collector. Our drawing was made from a specimen which 
flowered in that establishment for the first time this spring, 1840. It 
has been treated as other New Holland species. 
Derivation or tHE NaMeEs. 
Acacia, so named in the belief that the Acacia of the ancients is a species of 
this genus. Derren mot bene, in allusion to she tooth-like remains 
of the stipules. 
