402 E. C. ANDREWS. 
Contemporaneously with the development of the Phyllo- 
dines, the primitive type Gummiferee was being modified 
in another direction to produce the important endemic 
sections, Botryocephale and Pulchelle, of Bentham. 
The former is confined to eastern, the latter to western 
Australia. Pulchellz and Botryocephale appear to be 
modifications of Gummiferee in West and Hast Australia 
respectively, after the isolation of Australia from Asia and 
Africa, and during the development of the vast section 
Phyllodinez. 
In each section the persistent spinescent stipules of the 
Gummiferee have been suppressed. 
Many beautiful Acacias are included in Botryocephale, 
notably, A. dealbata, A. decurrens, A. polybotrya, A. 
Baileyana, A. elata, and A. spectabilis. The development 
of these types appears to have taken place in moist and 
cool south-eastern Australia, during the formation of the 
high plateaus, and the dissection of the same by stream 
action, in late geological time, while their distribution to 
the south of Queensland was due to the same activities 
which caused the northward journeyings of Tetramere, 
Racemose, and other sub-series. A. elatais suggestive of 
a later local development in the Blue Mountain District. A. 
leptoclada, A. polybotrya, A. spectabilis, and A. cardio- 
phylla, are later developments in the northern districts, 
which have become adapted in part to the drier inland 
conditions. A. discolor is an adaptation to poor sandy soil, 
and is a very hardy type. <A.decurrens isa hardy form, 
which, although one of the older Botryocephale like A. 
discolor, has been enabled to accommodate itself to sub- 
arid western conditions in Hastern Australia, as well as 
to the cooler and moister climate of Hastern Australia, 
either as the result of migrating west or by refusing to be 
driven out on the approach of sub-arid conditions in the 
