DEVELOPMENT AND DISTRIBUTION OF THE LEGUMINOSZ. 385 
east and west. Anagyris and Piptanthus are endemic in 
Eurasia. Thermopsis probably developed in Asia and 
spread through the Himalaya, China, Japan, Siberia, and 
to colder North America. This is a hardy type which 
possesses a dozen species, one of which grows at a height 
of 17,000 feet in the Himalaya. Baptisia and Pickeringia 
appear to be endemic in North America, probably as a 
modification of some form of Sophorez, which has dis- 
appeared. 
No Podalyriez has been recorded from South America. 
The members of this tribe in Australia are more specialised 
than the genera of the tribe in other countries, and have 
succeeded admirably as xerophytes. Strange thus as it 
may seem, the Podalyrieze, with its peculiar forms, its 
numerous genera and species, appears to be a group of the 
Leguminose which is relatively young, inasmuch as it has 
no tropical representative closer than the Sophorese; it 
has a great development in Australia but a very slight 
development outside that region, not even extending to 
South America; and, furthermore, its variability in different 
regions proclaims it in each case to be a local product of 
more recent origin than the widely-difiused tropical genera. 
GENISTEH.—The centre of dispersion for this tribe was 
the tropics, as in the case of the Sophoree, and, as with 
the Podalyriez, the extratropical development was mainly 
in the Old World and in Australia. Tropical forms became 
adapted to the inhospitable environments of the lands 
mentioned in connection with Podalyrieze, and there 
developed characters well adapted for protection. In 
Australia a response was made by certain tropical Genistez 
to the gigantic expanse of sand and harsh climate, which 
at the same time fostered species and genera so numerous 
and vigorous as those of the Podalyriez. Both the Aus- 
tralian and South African Genistee of the temperate regions 
Y—November 4, 1914, 
