angel's trumpet
Angel's trumpet is the name given to 3 species of flowers, 2 of which are poisonous, belonging to the Solanaceae family of flowers (the genus of Brugmansia and Datura), and the other belonging to the Plantaginaceae family of flowers.
They can be identified by their larger, trumpet-like shape, with colors ranging from yellow, white, and purple; each color associated with the aforementioned species, respectively.
Not to be mistaken for some types of lily, which can bear a resemblance to angel's trumpet, but are much smaller.