OF THE INTERIOR OF WESTERN AUSTRALIA. 251 
Centrolepide. 
The 3 genera and 14 species of the South-west dwindle in 
the desert to 2 genera, each with a single species. Both the 
latter are found in tbe South-west corner. 
Restiacee. 
There are 11 genera and 47 species of Restiaceæ in the South- 
west, but only 2 of the species (referred to 2 genera) advance 
thence into the desert. 
Cyperacee. 
The 5 desert genera and 14 species contrast poorly with the 
14 genera and 123 species known from Western Australia as a 
whole. Of the 14 species 1 is endemic and 6 are South-western ; 
while 7 are distributed over extratropical Australia, 3 of them 
not reaching the South-west corner. 
Graminee. 
West Australia has 38 genera of grasses and 115 species; in 
the desert there are, exclusive of Briza maxima, 24 genera and 
41 species. No species is restricted to the West Australian 
desert, but 3 are West and South Australian desert grasses. 
Moreover, 3 only are South-west species, while 23 are extra- 
tropical Australian, including the South-west. The 12 remaining 
are extratropical Australian species which do not reach the 
South-west corner. 
Filices. 
Only 6 genera showing 11 species (according to Mueller’s 
estimate) are natives of West Australia. From the desert 6 
species are known belonging to 2 genera. Of the 6, 5 are widely 
distributed in Australia, while 1 is a Larapintine species reported 
from the West Australian desert only close to its eastern 
boundary. 
The majority of the orders just mentioned are either predomi- 
nantly South-western, or they are orders represented in the 
desert by genera predominantly or at least strongly represented 
in the South-west corner. This remark applies speciaily to the 
following :—Dilleniaeezg, Rutaceæ, Leguminose, Podalyriex, 
Halorages, Umbellifere, Stylidew, Goodeniacex, Loganiacee, 
Epaeridex, Amaranthacew, Proteacew, Euphorbiacew, Hemado- 
races, Liliacex, Centrolepidi, and Cyperacex. The following 
are worthy of special notice. 
LINN. JOURN.-—BOTANY, VOL. XXXIV. T 
