Monkshood
A striking blue-violet garden and mountain flower containing potent toxic alkaloids.
Datura stramonium
Русское название: Дурман обыкновенный
A highly toxic annual with trumpet-shaped flowers and spiky seed capsules. Tropane alkaloids can cause severe delirium and cardiac complications. It is not a safe psychoactive or medicinal plant.

Do not use photographs or online summaries to identify wild plants for eating or medicinal use. Some poisonous plants resemble edible species and even handling certain species can cause harm. If poisoning is suspected, contact your local poison service or urgent medical care. Do not wait for symptoms.
Poison Control: poisonous plants (US) ↗Origin debated; widespread in temperate regions
Waste ground, roadsides and disturbed gardens
Images and brief descriptions are for learning, not for reliably identifying a specimen. Take particular care with poisonous plants and mushrooms.
Identification is never guaranteed by a photo. Scientific names are used to reduce confusion between local names.