They are rhizomatous, herbaceous perennial plants growing to 20-60 cm tall, with sagittate (arrowhead-shaped) leaves 10-55 cm long. The flowers are produced in a spadix, surrounded by a 10-40 cm long, coloured spathe, which may be white, yellow, brown or purple; some species are scented, others not. The fruit is a cluster of bright orange or red berries.
All parts of the plants are poisonous, containing significant amounts of calcium oxalate. Wikipedia
I love all the members of the Arum family, some of them have a very unpleasant odor - aka - stink terribly, but they are all very beautiful!