Voodoo lily (amorphophallus). I have these also and love them.

Actually, from your pic, I think this one is 'sauromatum venosum'. Here's a pic of mine taken a couple of weeks ago. It has the spotted stems also, but you can't see them in this photo. If you like the way it looks now, you should see the bloom (comes earlier in the season)! Really strange-looking, only lasts for a few days, and attracts tons of flies.

Thank you, wildflower. Definitely a match.

CV