101 



isachne, P. coloratum, P. nigropedatum, P. minus, P. ser- 

 ratuvi, Tricholaena rosea, T. arenaria. Tragus hoelerioides, T. 

 raccTnosus, Spornholus teneJlus, Pogonarthria squarrosa, 

 Diplachne paucinervis, Eragrosti.i dura, E. denudata, E. lepto- 

 calymma, E. pilosa, E. pusilla, E. viscosa, E. siiperba, E. 

 truncata, E. poa, E. pallens, Cynodon dactylon, Chloris 

 petraea, Ch. virgata, Crossotropis grandiglumis , Triraphis 

 rehmanni, Enneapogon hrachystachyus, E. mollis, Schmidtia 

 quinqueseta, Fingerhuthiu africana, Oropetium capensc. 



The tropical and sub-tropical connections of the species 

 composing this veld, is shown by the predominance of the 

 tribes Andropogoneae, Paniceae, Stipeae [Aristida), Era- 

 grosteae and Pappophoreae (Enneapogon and Schmidtia) and 

 by the large number belonging to the genera Aristida, Era- 

 grostis, Andropogon and Panicwn. The tribes Aveneae,. 

 Agrosteae, and Phalarideae are not represented, and the 

 Pestuceae only by Fingerhuthia, which belongs to a sub- 

 tropical section of that tribe, so this veld shows no temperate 

 affinities, and no connection at all with the South- Western 

 region. The connections with the immediately surrounding 

 regions are, on the other hand, fairly close. 



The treeless Grass veld of this region in many places. 

 develops into Tree Veld. The succession is essentially similar 

 to that in the Thorn Veld, which I have analysed in a recently 

 published paper. The dominant species are usually Acacias. 

 Under the Kaap plateau, along the right bank of the Orange 

 and the Vaal, there is fairly dense Acacia scrub, with the 

 Haakdoorn Acacia detinens dominant. Further north in the 

 Vryburg district, east of Honing Vlei, and north-west of; 

 Morokwen, there are large areas of Haakdoorn Scrub of a 

 similar nature. From Fourteen Streams northwards through. 

 Taungs and Bloemhof, the dominant plant is the Vaal bosch, 

 Tarchonanthus camphoratus . Further to the west, through 

 Kuruman, the following trees are dominant in the Tree Veld 

 or Bush Veld: — Acacia giraffae, A. karroo, A. horrida, A. 

 robusta, A. spirocarpoides, A. haematoa-ylon, Zizyphus mucro- 

 nata, Elephantorhiza hurchellii, Rhus spp., Royena pallens, 

 etc. Further north in Bechuanaland the tree species are 

 Acacia giraffae, Combretum primigenium, Boscia pechueli,. 

 B. microphylla, etc. In the northern Kalahari, the Tree Veld 

 is still more tropical in its nature, with Copaifera mopane, 

 Adansonia digitata, Peltophorum africanvm, Strychnos sp.,. 

 etc. 



