Datura n. : A genus of solanaceous plants, with large funnel-shaped flowers and a four-celled, capsular fruit.

Example:
What's the difference between Datura and Brugmansia?

Taxonomy
Datura, species, plants, Thorn-apple, Datura stramonium, unranked, deaths, free encyclopedia, species diversity, ingestion, seeds, Erowid, thorn apple, variation, substances, ingesting, genus, family Solanaceae.

Defination from the web:
Datura are woody-stalked, leafy annuals and short-lived perennials which can reach up to 2 meters in height. ... It is difficult to classify a datura as to its species, and it often happens that descriptions of new species are accepted prematurely. ...