TABLE 1* 
MORPHOLOGICAL COMPARISON 
OF DATURA AND BRUGMANSIA 
Datura 
Brugmansia 
Habit, Growth, Form and Longevity 
Herbaceous annuals or short- 
lived perennials which die back 
to their roots. 
Vegetative axes restricted to the 
basal portions of the plant. 
Branching restricted to the in- 
florescence. 
Plants lacking an effective 
means of vegetative reproduc- 
tion. 
Woody, relatively long-lived ar- 
borescent shrubs or smal] trees, 
producing vascular cylinders of 
considerable size. 
The vegetative axes not limited 
to the basal portions. 
Branching not restricted to the 
inflorescence. 
Plants reproducing vegetatively 
by root suckers and forming 
sizable clones. 
Inflorescence 
Inflorescence predominantly 
dichasial. 
Inflorescence is localized to the 
upper portions of the plant, and 
once initiated does not revert to 
vegetative growth. 
The major part of the plant is 
inflorescence. 
Inflorescence predominantly 
monochasial. 
Inflorescence not localized and 
reverts to a vegetative axis at 
the end of flowering. 
The major part of the plant is 
not inflorescence. 
Flower 
Flowers borne in an erect posi- 
tion. 
Flowers closing during the day 
and opening in the evening. 
Anthesis one or two days. 
Calyx not spathe-like except in 
Datura cerotocaula, the calyx 
teeth usually separating more 
or less equally. 
* After Barclay (2) with modifications. 
Flowers pendulous or inclined, 
never erect. 
Flowers remaining open during 
the day and throughout anthesis. 
Anthesis four to six days. 
Calyx frequently spathe-like or 
split along more than one side 
due to the failure of the calyx 
teeth to separate. 
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