This following a quick search for "arum", "lily" and "rotting" on Google:

The dead horse arum lily, Helicodiceros muscivorus, is a rather attractive
brown flower found on Corsica and other small islands in the Mediterranean.
The flower opens for two days, on the first of which it releases an
extremely foul odour reminiscent of rotting meat.

Lovely.

HTH

Jo

Debbie wrote in message
om...
I've got an arum lily flowering in my garden. I'm not sure of the
variety: I bought it years ago from a local alpine(!) show. It's
definitely not an A. italicum as I have some of those.

Anyway, I don't know whether it's the warm weather, or what, but this
thing is flowering profusely, and stinks to high heaven. Unfortunately
I have it planted too close to my outside picnic area, and this thing
is so bad that it's going to be a case of either digging it up, moving
our patio, or moving house (not that anyone would buy it at the moment
with that smell around). Until I discovered what it was (way too close
a sniff, with hindsight) I was thinking we had a problem with our
drains, or that I had a dead rat festering somewhere. It smells
totally disgusting (though looks rather nice!)

Does anyone know what the species is?

And hello again to anyone who knows me, I've not urg-led in a very
long time!

Debbie