Datura wrightii is also known as Sacred Thorn-apple and Jimsonweed. The white flowers can grow to six inches (15 cm) across.
The flowers open late in the day and close the following morning. I captured this image at sunrise at Vermillion Cliffs so this flower was in the process of closing.
All parts of this plant are hallucinogenic and can be fatal. Many kids think it might be fun to try this plant out, but many became very ill and are hospitalized if they are lucky to live, and the rest die.
And you thought the only thing to worry about in the desert were snakes and scorpions.