Pompom weed

Pretty, but very invasive in some areas of South Africa: pompom weed (Campuloclinium macrocephalum). Originally from South America, it has spread into many South African habitats, where it often displaces areas of grassland.

People in the know tell me that pulling these out can stimulate the remaining bits of root to even further growth, thus worsening the problem. Currently controlled by the laborious method of spraying herbicide on individual plants while trying not to harm the plants surrounding it, and by removing and burning the flowers. 

Cestrum

A species of Cestrum. Originally from the Americas, they are somewhat popular garden plants in South Africa. In some areas they have become invasive. They are also poisonous to some livestock.

Grass aloe

Aloe veracunda. It is one of a group of slender-leaved aloes known as grass aloes. The aloes have traditionally been classified under the family Liliaceae, and for the purpose of this blog, I'll keep them there. I have seen them classified under several different families though - taxonomy seems to be in a state of flux at the moment.

Wild apricot

Ancylobotrys capensis, Also known as wild apricot. The fruits are pleasantly sweet-sour. If the baboons leave you any, that is. They are found mostly along the edges of rocky hills.

Wild wormwood

Artemisia afra, also known as wild wormwood or, in Afrikaans, wilde als, a common herb in Gauteng. Used by traditional healers to treat chest conditions and intestinal worms. The crushed leaves are fragrant and probably actually help to open up the sinuses. Not sure about the worms, mind you.

Protea

Protea caffra, one of the most common species of Protea in Gauteng province.

Sweet thorn

Acacia karroo, a.k.a. sweet thorn, found throughout much of southern Africa. According to the Wikipedia page on the species, it is also known as Vachellia karroo, and it has a whole collection of other Latin synonyms. It is somewhat unusual in that it seems to have more (and more confusing) scientific names than common names.