116 DR. F. MUELLER ON AUSTRALIAN ACACIX. 
The section Brachybotry: is not well represented in the tropics. 
We observed of it, in Mr. Gregory’s expedition, only two new 
species,—one with winged fruit, the other an Acacia from N.W. 
„Australia, mentioned by Mr. Bentham under 4. melanoxylon as 
imperfectly known from Cunningham's collection, and of which э 
full description will be found in the accompanying pages. Both 
show the rather unusual character amongst phyllodineous Acacia, 
of being deprived of the strophiolum. А. complanata and А. venulosa 
are not found beyond the warmer parts of East Australia. Unless 
imperfect specimens misled me in judging, I may pronounce that 
А. pendula and А. sclerophylla extend through Central Australia 
to Arnhem's Land, where A. translucens was likewise noticed. We 
possess a common desert-plant in South Australia and Australia 
Felix, enumerated in the * Linnea’ (1856) as 4. elongata ; it seems 
io me not identical with the Blue Mountain plant, which 1 have 
compared, but rather to belong to A. viscidula. A. multinervia 
is found rarely in this colony ; but quite common is A. homalophylla, 
from Lake Torrens to the Darling and Murray, where A. steno- 
phylla likewise occurs. In a retrospective view it will be seen 
that 64 well-marked species alone occur in the collections of the 
North Australian Expedition, of which, after a patient scrutiny, I 
am obliged to admit 33 as new. By a further addition of some 
unpublished extratropical kinds, already contained in my former 
collections, the number of Australian Acacias becomes advanced 
to beyond 800, notwithstanding that some reductions of former 
species have been effected on this occasion. Most singular is 
the vast preponderance of Julifere in N. Australia, being nearly 
equal in number to those of all other sections collectively. Only 
4 desert-species traverse Australia from south to north; and 8 
only have hitherto been traced from Western Australia into 
the south-eastern portion of this continent. If, on the contrary, 
I rightly unite Acacia cuspidata with A. diffusa, not one of the 
Tasmanian species shows itself restricted to that island, except 
A. azillaris. 
Mr. Gregory observes that no pinnate-leaved Acacia is harboured 
by the interior of West Australia. 
Series I, Phyllodinece. 
8 1. Aphylle. 
1. Acacia spinescens, Bth. in Hook. Lond. Journ. of Bot. i. p. 322, 
pl. 2. z. 
Ad sinum Spencer's Gulf, C. Wilhelmi. Ad sinum St. Vincent’s Gulf, 
prope montes Barossa Range. Ad flumen Onkaparinga. 
