246 MR. 8. MOORE ON THE FLORA 
REMARKS ON THE RELATIONSHIP OF THE GENERA AND SPECIES 
OF CERTAIN ORDERS COMPOSING THE Desert Flora.” 
The following orders have been selected by way of comparison 
primarily between the Desert flora and that of the moister South- 
west part of Western Australia. 
Dilleniacee. 
Only 4 out of 46 of the S.W. species of Hibbertia (as under- 
stood by Mueller) reach the desert; all 4 are found south of 
lat. 30? alone, and noue advance eastward of the West Australian 
boundary. The other genera (i. e., those, exclusive of Candollea, 
Adrastea, and Pachyneura, which are combined by Mueller with 
Hibbertia) are Euronotian and have no representative in the 
desert. 
Rutacee. 
60 species ranged under 7 genera are known to oceur in West 
Australia: 5 of these genera have between them only 6 desert 
representatives. All the desert genera, except Geigera, are 
represented in West Australia as fully as, or more so than, in 
any other part of Australia. Moreover, all the desert species 
occur also in the South-west corner, and two of them extend into 
the South-east. 
Leguminos«, tribe Podalyriee.. 
Of this tribe West Australia has 245 species referred by 
Mueller to 19 genera: 12 of these genera are represented in 
the desert by 37 species, and no less than 15 of the latter are 
endemic in the desert, while of the remainder 18 are shared 
between the desert and the South-west corner. 
Haloragee. 
Of the 3 West Australian genera 2 are denizens of the desert. 
Haloragis with 27 South-western species, most of which do not 
pass over into the South-east, has 5 desert species, but 1 only of 
them is exclusively South-western ; 2 are endemic in the desert, 
and the 2 remaining reach into South Australia. 2 out of the 
3 known species of Loudonia are found in the South-west; both 
of these occur in the desert, and one is restrictedly South- 
western. 
* The statistics in this section are compiled largely from Mueller's “Second 
Census, 
