DEVELOPMENT AND DISTRIBUTION OF THE LEGUMINOSZ. 397 
the phyllode. With the object among other things, of 
Settling this important point, namely, the priority of Uni- 
nerves or Pleurinerves, Mr. Cambage is preparing a paper 
descriptive of many species of Acacia, in the seedling stage. 
In Eastern Australia, the phyllodineous Acacias usually 
occupy the sandy soils, especially in the moist and cool 
portions of the continent, while certain small subseries of 
the Pleurinerves and the Juliflorsze, such as the Microneurze 
in the Pleurinerves prefer the drier clay soils, as also the 
warmer, moist portions, on the outskirts of the jungle or 
*““prush.’’ Oentral Australia has formed a barrier to the 
migration of the majority of the types which grow in either 
West or Hast Australia, and the ancestral forms appear to 
have found paths down each side of the continent, develop- 
ing many new forms in the South, 
In the desert itself, and on much of the sandy barren 
soil, the phyllodes, in many instances, have been changed 
to needles, thorns, or to leathery or pungent forms, or to 
armed wing-like processes. These extreme types appear, 
in some cases, to be recent modifications of either Uni- 
nerves or Pleurinerves; in other examples, as in A. juni- 
perina, they may be older than the desert. | 
The probable development of the subseries Racemosee, 
Microneure, Nervose, Tetramere, and Falcatz, may be 
considered here in brief as indicating the various lines along 
which modification proceeded in the Phyllodineze. 
Racemosze.—These are Uninerves which, with few 
exceptions, grow in sandy soils. The phyllodia are gener- 
ally broad, rarely pungent, and they possess veinlets, either 
reticulate, or diverging from the midrib. The flowers are 
in globular heads arranged in axillary racemes. 
A few species are recorded from West Australia, but 
the majority occur in the south-eastern portion of the con- 
