. African invertebrates : a journal of biodiversity research. Invertebrates -- Africa; Biological diversity -- Africa; Biological diversity. 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 extensiv
. African invertebrates : a journal of biodiversity research. Invertebrates -- Africa; Biological diversity -- Africa; Biological diversity. 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
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