Luckily you can distinguish them from vegetative plants and flowers also.
1. Plants glabrescent; calyx 5-angled; corolla less than 12 cm long;
leaves sinnuate-dentate, anthers less than 5 mm long
(capsule erect, 4-valved, with stout up to 5 mm long prickles)...D. stramonium
1a. Plants glabrescent or hairy; calyx cylindrical; corolla
more than 12 cm long; leaves entire or sinuate but not
dentate, anthers longer than 1 cm (capsule deflexed, irregularly dehiscent)... 2
2. Plants gladular-pubescent, not purple; calyx 8-10 cm long; corolla 15-18
cm long, anthers 10-17 mm long (capsules deflexed, covered with slender
prickles, pubescent, irregularly dehiscent)......................D. inoxia
2a. Plants glabrescent, often purple; calyx 4-9 cm long; corolla 14-20
cm long; anthers 10-12 mm long (capsule deflexed, with short
broad-based short prickles, irregularly dehiscent)...............D. metel
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Dr. Gurcharan Singh
Retired Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297 Mob: 9810359089