Origin of tJie Angiospermoits Flora of South Africa. 831 



1(b). Maricincea. 

 Tropical and sub-Tropical America, 1 species in Tropical Africa 

 (probably introduced) . 



2. TigridiecE. 

 2(a). TigridincB. 



Chiefly developed in Tropical and sub-Tropical America. 



2(b). CipurincB. 

 Chief centres of development, the Cape and Tropical America. 



3. SisyrincJiiecE. 

 3(a). LihertincB. 



Bohartia (South Africa). 



Liber tia (Chile, New Zealand, South-East Australia). 

 Diplarrliena (Tasmania, South-East Australia). 

 Belameanda (Tropical East Asia and Japan). 

 3 (b) . SisyrinchincB. 

 South America down to the Straits of Magellan. 



4. AristecB. 



4(a). Pater sonincB. 

 Chile, Australia (including Tasmania). 



4(b). AristincB. 

 Chief centre of development the Cape, 2 genera in Tropical and 

 sub-Tropical America. 

 III. IxioidecB. 



1. IxiecB. 



Chief centre of development the Cape, radiating into Tropical 

 Africa. 



2. GladiolecB. 



Chief centre of development in South Africa and Tropical Africa, 

 eastwards to the Mascarene Islands and Socotra, northwards (only 

 the genus Gladiolus) reaching into the Mediterranean Eegion and 

 Central Europe. 



3. WatsoniecB. 



Chief centre of development South Africa, but also in Tropical Africa 

 and the Mascarene Islands. 



We see from this distribution that the Tropical African Iridacese 

 are, as it were, only outliers of the South African ones, which are 

 chiefly concentrated in the Cape Province. Only seven South African 

 genera extend beyond continental Tropical Africa : Morcea to 

 Madagascar and Australia ; Bomulea, northwards to Central Europe ; 

 Aristea, Geissorliiza, Watsonia, to Madagascar ; Babiana, to Socotra ; 

 Gladiolus, to Europe and the Orient. 



At this stage I would also, without further discussion, draw 

 attention to the remarkable distribution of the SisyrinchincB and 

 AristincB, perhaps the most primitive Iridacece. 



