Genus Brugmansia or genus Datura?

©Rich Sanders 1999-2003
©American Brugmansia & Datura Society (ABADS) 2003
 
Plants are tree-like
Flowers are pendulous or nodding below the horizontal. 
The calyx nods to or below the horizontal when the 
corolla first emerges 
See photo

Genus Brugmansia

 
Plants are herbaceous, may become somewhat woody,
calyx points above the horizontal upon emergence of the corolla
*
See photo
Flowers are generally erect.

Genus Datura

*Assuming the flowers fully emerge. 
D. leichhardtii
often has flowers that do not extend and open before 
pollination occurs. As a result, the flower and calyx nod without 
the flower ever being fully exposed.

©Rich Sanders 1999-2003

Brugmansia

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