Can't identify plant

This plant started growing in my San Francisco postage stamp size front yard this spring. The closest likeness I've found on-line is Yellow Skunk Cabbage, but my plant has a green flower with an orange stamen (?). Now the plant's leaves are wilting and it has sent up two fruits (?) the first one of which is now looking like berries and turning red. I've attached photos of the leaf, flower and fruit. I hope someone has an answer because it's been driving me crazy.

 

Hi,
it's an Arum sp. (A. italicum?)

 

Thank you for answering so quickly. I now see that many Californians are trying to get rid of it, but I'm happy if it takes over. I think it's the Italicum.
Barbara

 

Grown commercially down the road for the florest trade. I use them as background plantings.
Liz

 

My daughter lives in Victoria. I'll ask her if she's seen them. Thanks
Barbara

 

Victoria Australia or Canada?????
Liz

 

Morwell, Australia
Barbara

 

Ok thats bit of a hike from the hills. She is down in Gippsland. I over look that direction

I am where they grow a lot of daffodils and tulips amongst other commercial flower crops out the back of Melbourne

Liz.