Botanists know this flower as Datura wrightii. But I prefer to call it by the more common name, Sacred Thorn-apple. There were thousands adorning Tucson’s Sabino Canyon on the April day I visited. Bees swarmed all over them, but I didn’t get too close. Apparently, these lovely blooms are poisonous, offering a potentially fatal dose of hallucinogenic tropane alkaloids (didn’t know I was a scientist, did you?) to anyone who eats them.