In both D. stramonium and D. metel the plants are glabrous, hairy in D. inoxia
The deciding difference between D. metel and D. stramonium is that mature fruit of D. metel is drooping, covered with short blunt tubercles barely exceeding 3 mm; in D. stramonium mature fruit is erect covered with long spines up to 5 mm long.
In addition the following may help. Plants of D. metel are generally taller less branched and erect often reaching 1.5 m and tend to have purplish stem, in D. stramonium plants are shorter, more branched and spreading, stems not purplish.
The leaves of D. stramonium are generally parted, whereas they are not parted in D. metel
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
Species with description &
suaveolens Humb. & Bonpland ex Willd. (syn. of Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & J. Presl as per GRIN & The Plant List)
suaveolens Humb. & Bonpl. ex Willd. (syn. of Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & J. Presl as per GRIN & The Plant List)
Indigenous Drugs Of India By Chopra R N, I.C. Chopra (2006- Details-
Medicinal Plants in Andhra Pradesh, India By T. Pullaiah (2002- Details-
Encyclopaedia of World Medicinal Plants, Volume 1 By T. Pullaiah (2006- Details-
Brugmansia & Datura : 1 post by 1 author.