The Vegetation op Western Australia. 
XXV. 
(b) Chamaelaucieae. 
Lhotzkya 
(10) temp. Australia 
7 
Calythrix 
(40) Australia 
.... 37 
Calythropsis 
(1) S.W. Australia 
1 
Homalocalyx* 
(2) N.E. Australia 
Micromyrtus 
(13) Australia 
.... 12 
Wehlia 
(5) S.W. Australia 
5 
Pileanthus 
(3) W. Australia .... 
3 
Chamaelaucium 
(12) S.W. Australia 
. 12 
Thryptomene 
(22) temp. Australia 
.... 21 
Actinodium 
(1) S."W. Australia 
1 
Darwinia 
(31) temp. Australia 
.... 27 
Homoranthus* 
(2) E. Australia 
V erticordia 
(47) W. and N. Australia 
.... 47 
Summary. 
Sub-family Leptospermoicleae .... 41 genera. 
Australia .... .... .... 31 genera (15 endemic in S.W. Austr.) 
Austro-Malaya, extending to 
India, China, New Zealand, 
and 1 (Metrosideros) S. Africa 6 genera 
New Caledonia .... 
3 
genera 
Chile 
1 
genus 
Sub-family Myrtoideae 
.... 32 
genera 
America .... 
.... 22 
genera (mainly S. America) 
New Caledonia .... 
3 
genera 
Indo-Malaya 
2 
genera 
Malaya- Australia 
3 
genera 
Australia .... 
1 
genus 
Tropical Africa .... 
1 
genus 
' Tropics (general) 
1 
genus 
In the above, and succeeding table, the first column of figures in paren- 
thesis represents the total number of species in the genus ; the second indicates 
the number found in Western Australia. Names indicated by asterisks are 
those of genera not occurring in Western Australia. 
It will be seen that of the two sub-families of the Myrtaceae, the Lepto- 
spermoideae is predominantly Australian, but that three genera are restricted 
to New Caledonia, while one is South American. Of the Australian genera, 
half are endemic in South-Western Australia. In the sub-family Myrtoideae 
(those with baccate fruits), the position is quite otherwise, the majority of 
genera being endemic in America. The Chamaelaucieae, a tribe of the Lepto- 
spermeae, is strictly Australian, and this group alone, unless we include the 
nine endemic genera of the Leptospermeae, can be defined as an Australian 
Element. The southern, or Antarctic influence is expressed by Metrosideros 
and Tepualia. In any case, we see once more that the Australian Element 
is most richly developed in South-Western Australia. 
