Family: Oxalidaceae (Oxalis family).
Native of South Africa.
Occurrence: Soursob is a widespread and common weed of gardens, farmland, roadsides and bushland.
Soursob is a noxious weed and is listed as Regionally Restricted in central Victoria.It is a major weed of gardens and bushland, and is very difficult to eradicate. Each of the small bulbs can produce a new plant. In summer it dies down and may not be noticed.
Similar species: Soursob can be distinguished from native oxalis by its bright yellow flowers, the absence of an above-ground stem, the bright green leaves, and the numerous small bulbs. Native oxalis species usually have a duller leaves and flowers, are smaller plants, and have above-ground stems.