Brugmansia

Angel's trumpet (Brugmansia suaveolens) is a large, soft-wooded shrub or small tree hung with enormous pendulous trumpet flowers - up to 12 inches long, white aging to soft blush, and intensely fragrant in the evening and at night. Native to the Atlantic Forest of south-eastern Brazil (POWO, Kew; Flora e Funga do Brasil), it is now classified Extinct in the Wild by the IUCN and survives only in cultivation, which makes a familiar garden plant quietly remarkable. It grows fast and thirsty in warmth (USDA zones 9b-11b) and is frost-tender, so in cold-winter areas it is grown in a large container and overwintered under cover. The load-bearing warning is its toxicity: EVERY PART IS HIGHLY TOXIC, loaded with tropane alkaloids (scopolamine, atropine, hyoscyamine), and poisonings can be severe or fatal - never plant it where children or pets could reach it.

Tree thorn-apple (Brugmansia arborea), also known as angel's trumpet, horn of plenty or maikoa (RHS), is an evergreen to semi-evergreen shrub or small tree of the Andes, first described by Linnaeus as Datura arborea. Kew records it as native to Bolivia, northern Chile, Ecuador and Peru, and Wikipedia describes it from drier valleys at 6,562 to 9,843 feet that often see light frost. In gardens RHS gives it an ultimate size of 8.2 to 13.1 feet tall and 4.9 to 8.2 feet wide; in its home valleys it can reach 23 feet. Its strongly fragrant, nodding white to cream trumpets are only 5 to 7 inches long, the shortest in the genus, and each sits in a very long green calyx that reaches almost to the mouth of the flower - the quickest way to tell it from the many other white angel's trumpets sold under its name. It flowers almost continuously in small numbers rather than in big flushes. The load-bearing warning is its toxicity: RHS lists it as TOXIC if eaten, a skin irritant and toxic to pets, and every part of a Brugmansia is potentially poisonous, carrying tropane alkaloids (scopolamine, hyoscyamine, atropine), with the seeds and leaves especially dangerous - never plant it where children or pets could reach it. The IUCN Red List classes it as Extinct in the Wild, yet it is listed as invasive in New Caledonia. Wikipedia calls it the hardiest Brugmansia to both cold and drought, but RHS rates it H1c, wanting a winter minimum of about 41°F, so Plotwright publishes USDA zone 11 only and treats it as a container plant to bring under cover anywhere colder.