Datura quercifolia

Datura quercifolia, commonly known as the oak-leaved thorn-apple is a small shrub in the genus "Datura". It will grow equally well in dry or moist soils, provided that its need for high light levels is met, the plant only thriving in full sun.
The species was first described in 1818 by Alexander von Humboldt. Its leaves resemble oak leaves, hence the name "quercifolia". It grows in Mexico and the Southwestern United States and can assume both a prostrate and an upright bushy habit, bushier forms reaching up to 3 ft. in height. It produces green seed capsules armed with long sharp spines, which, like those of some (but not all) "Datura" species open by four equal valves. The pale violet, funnel-shaped flowers are less than 2 in. long.
Toxicity.
All parts of "Datura" plants contain dangerous levels of poison and may be fatal if ingested by humans or other animals, including livestock and pets. In some places it is prohibited to buy, sell or cultivate "Datura" plants.