DEVELOPMENT AND DISTRIBUTION OF THE LEGUMINOSAE. 399 
Other Racemose again, such as A. rubida, A. Ruppii, 
J. H. Maiden, and A. neriifolia, appear to have revived the 
old bipinnate foliage in great measure, both retaining this 
form of leaf, in extreme cases, until the plant attains a 
height of ten feet. Oambage’ records A. rubida fruiting 
during the bipinnate stage. 
Microneurze.—This subseries belongs to the Pleurinerves, 
with flowers in globular heads. Bentham records three of 
the species from West Australia, but the pods of two are 
unknown, and the pod of the third, A. coriacea, is not 
suggestive of the Eastern Australian types. 
On the other hand it would be advisable perhaps to 
include A. harpophylla and A. Cambagei in this group, 
although Bentham places A. harpophylla in another group. 
A. Cambagei was unknown to the great systematist. 
These, aS well as many other allied forms, appear to 
have been developed on the inland plains formed by the 
waste brought down from the eastern highlands, and upon 
which the Racemosz were being simultaneously developed. 
The soil chosen by the Microneure was a dense alluvium, 
generally reddish or blackish-grey in colour, especially in 
the cases of A. pendula (Myall or Boree), A. homalophylla 
(Yarran), and A. harpophylla (Brigalow). The nerves in 
the phyllodia are much obscured in most of the types 
because of the thickening of the phyllodes for the storing 
of moisture. A parallel among the Hucalypts is shown in 
the development of the ** Boxes”’ on the alluvium, of which 
Eucalyptus microtheca, EH. bicolor, EH. populifolia, and E. 
Woollsiana are types. In each of these two vast genera a 
marvellous and contemporaneous response has been made 
to every peculiar form of Australian environment. More- 
over, a study of these two contrasted types, growing side 
by side, furnishes a mute but eloquent testimony of the 
1 (22). 
