DEVELOPMENT AND DISTRIBUTION OF THE LEGUMINOSA. 387 
tions of each group belonging to any temperate geographical 
station being found in the tropical types. 
Neither Genistez nor Podalyriee has entered New 
Zealand, and this may be explained partly by the fact that 
the primary tropical forms, such as Crotalaria, would not 
have found a congenial environment in the narrow land 
connection as postulated by Hedley (38) connecting New 
Zealand, and Fiji, or New Caledonia, and partly, because 
the temperate forms have been evolved in Australia and 
elsewhere later than the separation of Australia and New 
Zealand from some common land mass. 
TRIFOLIEZ and LOTEH.—These are important tribes 
which appear to be of similar age to the Podalyriexe and 
the xerophytic Genisteze. Their home probably is to be 
sought in the temperate regions of the Northern Hemi- 
sphere, especially Hurasia. America was invaded from Asia. 
GALEGE.—A very old tribe, the members of which have 
had a remarkable history. Originally they appear to have 
possessed simple leaves in the main, but in common with 
other tribes, they branched from the ancestral forms sub- 
sequently to the development of pinnate leaves. In the 
tropicsthey were non-twining herbs, shrubs, woody climbers, 
or even trees. The evidence suggests that the tribe was 
well established during the tropical connection of America, 
Asia, Africa, and Australia, as also possibly New Zealand. 
Thus large genera such as Indigofera, Psoralea, Tephrosia, 
and Sesbania, are all divisible into several or more sections, 
and the majority of these sections even are widely diffused 
throughout the tropics. Great powers of adaptation to 
environment are exhibited even by these tropical genera, 
inasmuch as they are of uniform primary type in the tropics 
but are of variable secondary type in the temperate regions, 
the variations moving along similar lines in each distinct 
temperate region but in divergent directions in different 
temperate regions. 
