Datura discolor Bernh. (Introduced)
Datura ferox L. (Introduced)
Datura innoxia Mill. (Introduced)
Datura metel L. (Introduced)
Datura stramonium L. (Introduced)
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 & keys in Flora of Pakistan :
Datura fastuosa L. (syn. of Datura metel L. as per POWO)
Datura innoxia Miller
Datura stramonium L.
Datura suaveolens Humb. & Bonpland ex Willd. (syn. of Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & J. Presl as per GRIN & The Plant List)
Species with distribution in annotated checklist of Flowering plants of Nepal :
Datura metel L.
Datura stramonium L.
Datura suaveolens Humb. & Bonpl. ex Willd. (syn. of Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & J. Presl as per GRIN & The Plant List)
Species with description & keys in Flora of China :
Datura inoxia Miller
Datura metel Linnaeus
Datura stramonium Linnaeus
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-
Datura sanguinea Ruiz & Pav. is a synonym of Brugmansia sanguinea (Ruiz & Pav.) D.Don &
Brugmansia & Datura : 1 post by 1 author.
Datura page with comparative images:
Pl. go through Datura (Solanaceae) page with comparative images of species in efloraofindia. On clicking the link of species, one can check the complete details. Genus pages generally give details of most of the species found in India.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identification in future. If anybody can send images of other species of this genus (for incorporation in the website), if any, or can identify unidentified images, it will be really nice. Pl. circulate it widely, for the benefit of all concerned.