This unique vegetation type occurs only within the city ofCape Town, particularly in a band that encircles the Table Mountain range – following the stratum of the Cape Granite Suite. It occurs from Lion's Head in the north, to Hout Bay and Muizenberg in the south. There is also an isolated patch near Simonstown, further to the south. It grows on the gentler, lower slopes of Table Mountain, over rolling hills and valleys - in rich, deep soils formed from eroded granite. Because of the rich soils and gentle terrain, most of this ecosystem has been destroyed to make way for vineyards, wealthy suburbs and commercial pine plantations. In fact, the largest patches of exposed granite soils are at Newlands, Wynberg Hill and Constantia, and these are all areas that have been developed for housing, farmed, or planted with invasive pine trees.
Description
Peninsula Granite Fynbos is dominated by Asteraceous and Proteoid species, although Erica and restio species become more dominant in wetter patches. There are two distinct subtypes of this vegetation: the especially endangered South Peninsula Granite Fynbos which grows on the more lush southern and eastern slopes, and North Peninsula Granite Fynbos which dominates the drier northern and western slopes. A striking feature of this vegetation is the presence of massive, tree-like Proteas such as the groves of Waboom trees which grow in the northern section, the famous Silvertrees which dominate the wetter southern and eastern slopes, and the endemic Grey Tree Pincushion Protea which covers the drier western slopes. Tall, dense, indigenous Afromontane Forest takes over from fynbos in any areas that are protected from seasonal fires, especially in river valleys and wetter areas. Peninsula Granite Fynbos used to support a great many wild animals but the larger game is now mostly locally extinct.
Today the major threat to this endangered ecosystem is definitely from invasive alien plants. The two main invaders are Wattles and Pines. In fact, much of the remnants of this endangered vegetation type are still beneath large commercial pine plantations. However, apart from the main two, there are a great many other invasive plant species – both trees and smaller plants. This is actually one of the most severely invaded of all vegetation types in South Africa. Another threat is the prevention of the seasonal fires that naturally sweep the area every few years, replenishing and revitalising the vegetation. Without the fires, the fynbos plants grow old and die, and their seeds cannot germinate. The areas of dense Afrotemperate forest then expand and replace the fynbos. Some of the plants that are endemic to this vegetation type and occur nowhere else are:
Leucadendron grandiflorum
Hermannia micrantha
Gnidia parvula
Cliffortia carinata
Polycarena silenoides
Erepsia patula
Lampranthus curvifolius
Aristea pauciflora
Willdenowia affinis
A related vegetation type is Boland Granite Fynbos, a vulnerable fynbos type that occurs to the east.
