OK, flora sleuths out there. Here's another unknown plant/weed. It was found in a suburban garden in Hawkes Bay, New Zealand. This area experiences frosty days in winter and dry hot summers. Soil is fairly shallow and there is a clay pan near the surface.
This is the information sent with it:
"...grows to about 30cm. in about a month in spring and very quickly puts out conker-like pods that have hundreds of black seeds within. The plant has a very pungent smell.
Found a couple of plants in the garden here at no:60 when we first got here. Carefully lifted them and didn't get any seedlings last year."
So, does anyone recognise this one? You can see a couple of the seeds in the image.