Datura discolor Bernh. (Introduced)

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Datura ferox L. (Introduced)


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Datura innoxia Mill. (Introduced)

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Datura metel L. (Introduced)

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Datura stramonium L. (Introduced)
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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 

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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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BSI Flora of India Checklist Vol. 2 (1993) (Distribution):

Name Distribution
Datura ferox Karnataka, Maharashtra, Rajasthan, Tamil Nadu
Datura inoxia Andhra Pradesh, Arunachal Pradesh, Bihar, Goa, Gujarat, Haryana, Himachal Pradesh, Jammu & Kashmir, Karnataka, Kerala, Lakshadweep, Madhya Pradesh, Maharashtra, Rajasthan, Tamil Nadu, Uttarakhand, Uttar Pradesh
Datura metel Throughout India
Datura stramonium Throughout India

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Flora of Peninsular India:
Datura arborea (syn. of Brugmansia arborea (L.) Sweet as per POWO)
Datura cornigera (syn. of Brugmansia arborea (L.) Steud.)
Datura ferox
Datura innoxia
Datura metel
Datura quercifolia
Datura sanguinea (syn. of Brugmansia sanguinea (Ruiz & Pav.) D.Don as per POWO)
Datura stramonium
Datura suaveolens (syn. of Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Sweet as per POWO)


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From Floral Database of Tamilnadu
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Binomial Habit               Notes Ref. Distrib.
Datura
cornigera
Hook. (syn. of Brugmansia arborea (L.) Steud.)
Shrub Western Ghats,  High Altitude, Cultivated, Native of
Tropical America
Flora of Tamil Nadu, VOL. II,
1987
Nilgiri
Datura ferox L. Herb Plains, Naturalized, Native of
China
Flora of Tamil Nadu, VOL. II,
1987
Coimbatore, Tirunelveli
Datura innoxia Mill. Herb Plains, Naturalized, Native of
Tropical America
Flora of Tamil Nadu, VOL. II,
1987
All districts
Datura metel L. Herb/ Under shrub Plains, Native of Tropical
America
Flora of Tamil Nadu, VOL. II,
1987
All districts
Datura sanguinea Ruiz & Pavon (syn. of Brugmansia sanguinea (Ruiz & Pav.) D.Don) Shrub Western Ghats, High Altitude, Cultivated, Native of
Tropical America
Flora of Tamil Nadu, VOL. II,
1987
Dindigul, Nilgiri
Datura stramonium L. Herb/ Under shrub Western Ghats & Eastern
Ghats, Moist Deciduous Forests
Flora of Tamil Nadu, VOL. II,
1987
Coimbatore, Namakkal,  Nilgiri, Salem, Tiruvanna malai

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Species with description & pictures in Flowers of India as on 1.1.14:
 

Botanical name Synonyms Family Common name
Datura ferox Solanaceae Fierce Thorn Apple
Datura innoxia Solanaceae Datura
Datura metel ‘Blackcurrant Swirl’ Solanaceae Datura Blackcurrant Swirl
Datura metel ‘Flore Pleno’ Solanaceae Datura Double Purple
Datura metel Solanaceae Datura Triple Yellow
Datura stramonium Solanaceae Jimsonweed
Datura wrightii Datura meteloides is a synonym of Datura innoxia Mill. Solanaceae Sacred Datura

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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)

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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)


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Indigenous Drugs Of India By Chopra R N, I.C. Chopra (2006- Details-

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Medicinal Plants in Andhra Pradesh, India By T. Pullaiah (2002- Details-

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Datura arborea L. is a synonym of Brugmansia arborea (L.) Steud.,

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Brugmansia & Datura : 1 post by 1 author.
I have updated efi page on Brugmansia & Datura.
Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links.
Any comments are welcome.

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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.