summer temperature is between 21-26° C. The winters receive quite a bit of snow. The mean annual precipitation ranges from 15-26 cm. Vegetation Canopy in most deserts is very rare. Plants are mainly ground-hugging shrubs and short woody trees. Leaves are "replete" (fully supported with nutrients) with water- conserving characteristics. They tend to be small, thick and covered with a thick cuticle (outer layer). These plants include: yuccas, ocotillo, turpentine bush, prickly pears, false mesquite, sotol, ephedras, agaves and brittlebush. The spiny nature of many plants in semiarid deserts provides protection in a hazardous environment. Many plants have silvery or glossy leaves, allowing them to reflect more radiant energy. These plants often have an unfavourable odor or taste. Semiarid plants include: Creosote bush, bur sage, white thorn, cat claw, mesquite, brittle bushes, lyciums, and jujube. Animals
trees over 5 metres are uprooted completely. Exotic plant species A number of exotic plants species have been introduced to the savannas around the world. Amongst the woody plant species are serious environmental weeds such as Prickly Acacia (Acacia nilotica), Rubbervine (Cryptostegia grandiflora), Mesquite (Prosopis spp.), Lantana (Lantana camara and L. montevidensis) and Prickly Pear (Opuntia spp.) A range of herbaceous species have also been introduced to these woodlands, either deliberately or accidentally including Rhodes grass and other Chloris species, Buffel grass (Cenchrus
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