I have been searching for a workable key to Australian Portulaca and a comprehensive treatment of the main species. It appears that the best by far is Bentham and Mueller's Flora Australiensis Vol. 1 (1863). The relevant pages can be viewed from these links. (Requires Acrobat Reader).
Flora Australiensis Vol. 1 cover
Flora Australiense Portulaca page 167
Flora Australiense Portulaca page 168
Flora Australiense Portulaca page 169
Flora Australiense Portulaca page 170
The key shown in Stanley & Ross's Flora of SE Queensland Vol. 1 (1983) is one that I often refer to. I personally like this publication's treatment of P. filifolia, P. pilosa and P. australis. In future blog posts I will examine these species in more detail and will also introduce some of the unknown and indeterminate plants that may be found in Queensland.
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