Abstract

The existing weed flora in any region is an amalgamation of indigenous species with introduced ones, although a clear distinction between the two cannot always be established because the origin of some weeds remains obscure. The provenance, for example, of Procumbent Yellow-sorrel (Oxalis corniculata), a weed of gardens and lawns in warmer regions, has yet to be definitely established, although it may have originated in the Pacific and spread to Europe by way of the Americas (Baker, 1972).

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