buffy said:
Aha! Citrullus lanatus var. lanatus (camel melon, wild melon, bitter melon, pie melon) is, however, more “widespread throughout mainland Australia”. (Auld and Medd). So I’m probably going with this. I’ll let it grow a bit more and watch it.
I don’t think so Buffy. As far as distribution, Citrullus lanatus is in the NW Mallee (Murray River region) and a very long way from coastal regions. Cucumis myriocarpus on the other hand is very widespread and was recorded from all locations around where you are over 40 years ago, and with such a weed for it to move into your territory over this period is more than likely.
The leaves are different too, C. lanatus has pinnate foliage, whereas C. myriocarpus has palmate, as does your photograph.
I am not aware of C. myriocarpus having any unusual smell to their leaves when crushed.
Below is a good link to C. myriocarpus.
http://keyserver.lucidcentral.org/weeds/data/03030800-0b07-490a-8d04-0605030c0f01/media/Html/Cucumis_myriocarpus.htm