Searsia erosa, commonly known as Broom Karee or Besembos, is one of the most common shrubs in the conservancy. It is an evergreen shrub or small tree that can grow up to 4 meters tall and spread about 9 meters wide. It features distinctive trifoliate leaves with long, narrow leaflets, with jagged erose edges. This fast-growing plant is excellent for soil conservation and preventing erosion, but it is not typically grazed. It thrives in harsh environments, tolerating both drought and frost, and is sometimes used for hedging. Its branches and leaves are traditionally used for thatching and broom-making, and because the leaves stick together, branches can be stuck together to make a temporary roof if one is caught in a storm.
Pollinated by bees and other insects, its flowers later produce fruit that birds feed on. The plant holds cultural significance, being used in rainmaking ceremonies in Lesotho, and parts of it are used in traditional medicine for treating diarrhoea in both humans and cattle. Dried leaves are also ground to dust and mixed with tobacco snuff.