THE PLANT ECOl-OGY OF DRAKENSBEKG RANGE. 548 



zone, but witli this important difference, that the larger 

 trees are absent from the latter, being replaced by " elfin " 

 groAvth-forms and shrubs. 



4. SCRUB. 



This is usually an association in which Leucosidea sericea 

 (Oudehout) is the dominant tree, and may therefore be 

 referred to as Oudehout Scrub. It is denser than the rocky 

 Greyia type, and the separate examples of it are usually 

 much more extensive, sometimes occupying the whole of a 

 ravine system and extending over the hillsides. 



The bed of the Tugela below the Mont aux Sources is 

 occupied by open Leucosidea scrub to an altitude of about 

 7000 ft. It is well developed around Van Reenen^s Pass 

 (PI. XXXYI) and other parts of the Drakensberg visited by 

 the writer ; in fact, it may be looked upon as the most 

 •extensive of the tree associations in the mountain region. 

 In many cases the association is remarkably pure, differing 

 in this respect from the Bush formation. 



In such cases it consists of Leucosidea sericea dominant, 

 with sometimes Buddleia salvia3f olia (Sagewood or Salie- 

 hout) sub-dominant. Often, however, the association is much 

 more mixed ; the following list of species being characteristic 

 ■of it : Leucosidea sericea, Buddleia salvigef olia, Cus- 

 sonia spicata, Heteromorpha arborescens, Royena 

 lucida,E,hus dentata,and several other species; Pavetta 

 ■caffra, Euclea undulata, Schraidelia africann, 

 Rhamnus prinoides, Plectronia mundtiana, P. ven- 

 tosa, Celastrus buxifolius, C. albatus, C. undatus, 

 Burchellia capensis, Halleria lucida, Vangueria 

 ■caffra, Clausena ina^qualis, Scutia commersonii, 

 Grewia occidentalis, Cluytia sp., Cliffortia lineari- 

 folia, C. natalensis, C. prostrata, Elteodendron sp., 

 Cassinopsis capensis, Osyris abyssinica, and other 

 species. 



The following lianes : Scutia commersonii (Avhich. soiiie- 

 VOL. 3, PART 3. 36 



