Other names: Jamestown weed, mad apple, thorn apple, stinkwort
Life cycle: Summer annual
Found in: Cropland throughout most of the U.S., except the Northwest.
General description: Erect odorous plant with large white to purple flowers and a stout, hollow stem.
Seedlings: Cotyledons are thick, smooth and about 2" long, with a linear outline and distinctive midvein. Hypocotyl is at first maroon at the base and later turns maroon throughout.
True leaves: Large—3" to 8" long and 6" wide—ovate and hairless with large triangular teeth on the edges. When touched or crushed, the leaves emit an unpleasant smell.
Flowers and fruit: Flowers are white to purple, 2" to 5" long, funnel-shaped and bloom on short, stout stalks. Fruit is an egg-shaped capsule with stiff prickles.