Can you help me identify this tree and this flower.

As near as I can determine from my Audobon book, the tree is some kind of
sumac, but I could be wrong.

http://k_cook.home.mindspring.com/sumac.jpg

The flower just appeared in a flower bed this summer. I don't remember
planting it. It is on a long stem, and the plant reminds me of some kind of
bulb or iris plant.

http://k_cook.home.mindspring.com/redflower.jpg