Keys for Brugmansia : 1 post by 1 author.
I could only get these keys at
https://drugs-forum.com/threads/taxonmic-key-to-datura-and-burgmansia.100818/
I think we have to sort out our posts based on this.
If somebody is aware of better/ other keys for Indian plants, pl. post.

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Brugmansia × candida Pers. (As per efi thread: In B. suaveolens the narrow lower part of corolla tube is visible above the calyx tube which is 5-toothed, and the flowers are slightly shorter. In B. candida the flowers are slightly longer, lower part of corolla tube hidden in calyx tube, and the calyx tube split on one side)
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Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & J.Presl (As per efi thread: In B. suaveolens the narrow lower part of corolla tube is visible above the calyx tube which is 5-toothed, and the flowers are slightly shorter. In B. candida the flowers are slightly longer, lower part of corolla tube hidden in calyx tube, and the calyx tube split on one side)
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BSI Flora of India Checklist Volume 2 (1993) (Distribution):
Brugmansia candida Pers. (Maharashtra, Tamil Nadu)
Brugmansia sanguinea (Ruiz & Pav.) D. Don in Sweet ()
Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & J. Presl (Arunachal Pradesh, Assam, Gujarat, Himachal Pradesh, Jammu & Kashmir, Karnataka, Kerala, Maharashtra, Manipur, Meghalaya, Mizoram, Nagaland, Odisha, Sikkim, Tamil Nadu, Uttarakhand,Uttar Pradesh)


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Flora of Peninsular India with keys at species links, if any:
Brugmansia arborea (No distribution shown as per POWO and CoL)
Brugmansia suaveolens
Brugmansia versicolor (No distribution shown as per POWO and CoL)


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From Floral Database of Tamilnadu :

Binomial Habit Notes Ref. Distrib.
Brugmansia arborea (L.) Lagerh. (No distribution shown as per POWO and CoL) Shrub Western Ghats,
Cultivated/ Naturalized, Native of Tropical America
Flora of Tamil
Nadu, VOL. II, 1987
Dindigul, Nilgiri
Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & Presl Shrub/
small tree
Western
Ghats & Eastern Ghats, Cultivated, Native of Tropical America
Flora
of Tamil Nadu, VOL. II, 1987
Dindigul,
Nilgiri, Salem
Brugmansia versicolor Lagerh. (No distribution shown as per POWO and CoL) Shrub Western
Ghats, Native of Tropical America
Matthew,
1999
Dindigul

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Species with description in Flora of Pakistan :
Brugmansia suaveolens (Humb. & Bonpland ex Wild.) Bercht. & Presl,

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Species with distribution in annotated checklist of Flowering plants of Nepal :
Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & Presl

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

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Floriculture in India By Gurcharan Singh Randhawa, Amitabha Mukhopadhyay (1986- Brief details)- p. 142-

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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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Pl. go through Brugmansia with images of species in efloraofindia.

If you find any mis-identification, pl. let us know.

If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice.