250 MR. 8. MOORE ON THE FLORA 
the 3 reaches the South-west corner; 28 are South-western 
species; 2 are extratropical Australian, including the South- 
west, and as many are extratropical or subtropical Australian, 
but absent from the South-west corner. 
Euphorbiacee. l 
West Australia has 13 genera with 51 species. 9 genera and 
19 species are found in the desert: of the 19, 4 are endemic and 
6 are South-western species; 3 are extratropical Australian, 
including the South-west; and 6 are similarly distributed, except 
that they are absent from the South-west corner. 
Casuarinee. 
Mueller enumerates 15 species as natives of West Australia. 
There are 8 desert species, and of them 2 are endemic in the 
desert; 3 are South-west species; 1 is South Australian, and 
extends into the desert south of 30°; while 2 are tropical and 
extratropical Australian, excluding the South-west. 
Orchidee. 
As might be expected, there is in the desert a great falling off 
in the number of representatives of this order. Only 6 species 
belonging to 4 genera are reported from the desert, as against 
18 genera and 75 species in the South-west; 4 of the desert 
species are South-western and 2 are extratropical Australian, 
including the South-west corner, 1 of the 2 reaching Polynesia 
and New Zealand. The genera represented in the desert are, it 
may be added, T’helymitra, Pterostylis, Diuris, and Microtis, and 
only the latter is known from that part of it lying north of 30°. 
Hamadoracee. 
3 of the 5 West Australian genera have desert representatives, 
but only 5 of the 56 South-western species advance into the 
desert. 
Liliacee. 
The 15 desert species (referred to 18 genera) contrast poorly 
with the 25 genera and 76 species from the moister parts of 
West Australia. Only 1 of the 15 species is endemic; 7 are 
South-western species ; 6 are extratropical Australian, including 
the South-west; and 1, while widely distributed over extra- 
tropical Australia, is not found in the South-west corner. 
