388 E. C. ANDREWS. 
Like the Genisteze, many endemic and vigorous genera 
of Galegez occur in extra-tropical regions, and such may 
be referred to later differentiation, being analogous to the 
Podalyrieze and xerophytic Genisteze. Amorpha, Dalea, 
Kuhnistera, and Brogniartia are American types some of 
which appear to have reached South America by migration 
along the high western plateaus. 
An interesting and instructive history is that of the group 
comprising Lessertia, Swainsona, Oolutea, Astragalus, 
Caragana, Oxytropis, Clianthus, Streblorhiza, Carmichzelia, 
Notospartium, and Corallospartium. 
All or most of these appear to have had a community of 
descent ata date later than the development of forms such 
as Indigofera, Sesbania, and Tephrosia, but nevertheless at 
a time while Australia was yet joined to Asia and Africa 
by way of the tropics. New Zealand may have been con- 
nected by land to the tropics, this is inferred from an 
analysis of the genera under consideration. The tropical 
ancestor, or ancestors, has, or have, disappeared, unless 
it be the form in Asia supposed to be Swainsona. One 
branch, however, of the tropical form became the Lessertias 
in Africa, one the Coluteas in the Northern Hemisphere, 
and one the Swainsonas in Australia and New Zealand. 
Astragalus, and Caragana, in the Northern Hemisphere, 
and Oarmicheelia, Corallospartium, and Notospartium, in 
New Zealand, are closely allied forms, as are also Clianthus 
in Australia and New Zealand and Streblorhiza in Lord 
Howe Island. 
Colutea, Lessertia, and Swainsona are strikingly alike, 
and they are examples of types which have flourished apart, 
but have not changed perceptibly for ages. Astragalus, 
according to Bunge,’ is a vast genus of about 1,200 species. 
Like the Genistez, it has spread from the Mediterranean 
* Quoted from Taubert, (60). 
