It looks like it is a a Sauromatum (formerly Typhonium) venosum. It should be hardy if you want to plant it outdoors and leave it.
http://www.aroid.org/genera/sp...
The plant is in the Aroid family. The whole plant is a leaf. The stem is called a petiole and is green with darker spots. The bloom is called an inflorescence and it grows and blooms, then dies back, and the leaf comes up. Here's photos of one of mine, with leaflets, petiole (sideways photo, sorry), and inflorescence.
They are interesting plants, some say they look like little palm trees. Some people collect them for their unusual blooms, many just like the spotted petioles. The flowers do have a dead animal type smell, usually only in the mornings and for 1 or two days. This is to attract flies and other pollinators. If the smell bothers you, spray it with some water and the smell goes away.
Funny story about the smell, I was a member of the Aroid plant email list for years and years and one year someone said they were at Cosco and someone had a BOUQUET of the blooms on their desk. He was amazed there was no smell, the woman explained she just sprayed them with a hose before cutting. It stunned the entire community, and I'm talking botanists, plant professionals, and educators. No one had ever thought of that before! Still makes me laugh.
Also in the Aroid family are Amorphophallus, also a bulb, have a very similar leaf, the (flower) looks a little more like a Calla lily. The most famous is Amorphophallus titanum, or Corpse Flower, whose bloom can get to 8 ft tall and leaf about 15 ft tall, or taller. You can find all different kinds of Amorphophallus on ebay. Almost all are not cold hardy.
PS I hope I've guess right about your plant ID. Put it outside in partial shade and send another photo when it opens more!
