101 



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

 ratum, Tricholaena rosea, T. arenaria, Tragus koelerioides, T. 

 racemosus, Sporobolus tenellus, Pogonurthria squarrosa, 

 Diplachne paucinervis, Eragrostis dura, E. denudata, E. lepto- 

 calymma, E. pilosa, E. pusilla, E. viscosa, E. superba, E. 

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

 petraea, Ch. virgata, Crossotropis grandiglumis, Triraphis 

 rehmanni, Enneapogon brachystachyus, E. mollis, Schrnidtia 

 quinqueseta, Fingerhuthia africana, Oropetiwm capense. 



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 (Enneapoyon and Schrnidtia) and 

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

 grostis, Andropogon and Panicum. The tribes Aveneae,. 

 Agrosteae, and Phalarideae are not represented, and the 

 Festuceae 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 (jrass 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 Yaal, there is fairly dense Acacia scrub, with the 

 Haakdoorn Acacia deiinens 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 Yaal bosch, 

 Tarchonanthus camphoratus. Further to the west, through 

 Kuruman, the following trees are dominant in the Tree Veld 

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

 robusta, A. spirocarpoides , A. haematoxylon, Zizyphus mucro- 

 nata, Ele pliant orhiza burchellii, Rhus spp., Royena pollens, 

 etc. Further north in Bechuanaland the tree species are 

 Acacia yiraffae, Combretum primigenium, Boscia pechueli, 

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

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

 Adansonia digitata, Peltophorum africanum, Strychnos sp.,. 

 etc. 



