Abstract
Summary:When plants of Emex australis Steinh. and E. spinosa Campd. were grown in pots in monoculture or in competition, there was greater seedling mortality in E. australis. In competition with E. spinosa, E. australis was later‐flowering and had lower seed, leaf, root and total dry weights. However, in E. spinosa leaf, stem, seed and total dry weight were greater than they were in mono‐culture. The more bulbous root and more erect stems of E. spinosa may be linked with its greater competitive ability. Although at present much more restricted in occurrence in Australia than E. australis, the results suggest that E. spinosa will in time become the dominant species where the two occur together.
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