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Acacia (weeds) Mill.
The genus of Acacia contains more than 1,000 species of shrubs and trees. It is widely distributed, mainly in the southern hemisphere. The majority of species are found in Australia. Some of them have been introduced into other regions and are regarded as weeds. E.g. Acacia longifolia and A. saligna have both spread to South Africa where they aggressively compete with native plant species.
The plants are typically evergreen with alternate and bipinnately arranged leaves. There are spines at the base of the leaves. The inflorescences are yellow or whitish and normally develop in spherical heads, usually from the leaf axils. The seed pods are elongated. The seeds are oval and remain viable in the environment for many years. In some species the seeds require fire before germination.
Type species: Acacia nilotica
Currently, the following species have been entered into the system: