374 E. C. ANDREWS. 
are even endemic in West Australia, nevertheless the two 
countries are in direct land connection by way of South 
Australia and the Northern Territory. The only barrier 
between the two countries is a sub-arid to arid tract of 
land south of the fifteenth parallel of south latitude. In 
this case the common types appear to have originated 
mainly in the north and later to have worked southwards 
around each side of the barrier, into West and Hast Aus- 
tralia. This slow migration of genera or species of plants 
across regions of barren soil, or of sub-arid to arid climates, 
must ever be kept in mind in dealing with problems such as 
that under consideration. 
Leguminose Indigenous to Various Countries. 
This section has been placed here instead of in the 
chapter on “Geographical Distribution,”’ because it depends 
in part, for its understanding on the foregoing chapter. 
GENERA OF LEGUMINOS2Z INDIGENOUS IN NEW ZEALAND 
AND AUSTRALIA, 
New Zealand contains seven genera and twenty-nine 
species, while Australia contains ninety-seven genera and 
nearly 1,300 species of legumes. 
In any attempt to ascertain how many of these genera 
and species are really indigenous in the lands under con- 
sideration, it would be necessary to exclude shore types, 
which may be believed reasonably to have been carried 
thither by means of animals, by sea currents, or by winds. 
In the case of sea currents, a study of Dr. Guppy’s’* work 
is invaluable. 
The endemic genera such as Corallospartium, Notospar- 
tium, and Carmicheelia in New Zealand, and Brachysema, 
Isotropis, Jansonia, Chorizema, Viminaria, Jacksonia, 
1 Naturalist in the Pacific. Plant Dispersal, 1905. 
