The Journal of the Australian Plants Society is called "Australian Plants" and is published quarterly. Current issues are included as a standard part of the membership package for the The Australian Plants Society, NSW.
So that you can see an example of what is covered in an issue of Australian Plants, a PDF file of the September 2011 issue has been provided as a sample. (click on either the image, or the PDF icon to view this issue).
(Each quarterly issue is A5 size, 48 pages.) To obtain a copy, send (in Australian currency) AUS$5.00 plus A$1.50 for packing/postage within Australia to Australian Plants Society NSW, P.O. Box 5026 Old Toongabbie NSW 2146 .
Indexes for the past volumes of Australian Plants are available below as PDF files.
Australian Plants
Index to Volumes 1 - 18
These volumes comprise issues 1 to 148
This Index is now available as a pdf file
Australian Plants
Index to Volumes 19 - 23
These volumes comprise issues 149 to 189
This Index is now available as a pdf file
Australian Plants
Index to Volume 24
Volume 24 comprises issues 190 to 197
The Index to Volume 24 is now available as a pdf file