Datura ferox (Introduced)

Datura ferox L., Demonstr. Pl. 6 1753. (Syn: Datura laevis Bertol.);
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Texas to Mexico: Mexico Central, Mexico Northeast, Mexico Southwest, Texas; Introduced into: Algeria, Argentina Northeast, Argentina Northwest, Argentina South, Bolivia, Botswana, Brazil South, California, Cape Provinces, Cape Verde, Chile Central, Chile North, Chile South, Colombia, Czechoslovakia, France, Free State, Great Britain, Greece, India, Italy, KwaZulu-Natal, Lesotho, Mali, Namibia, New Caledonia, New South Wales, New Zealand North, New Zealand South, Northern Provinces, Northern Territory, Palestine, Primorye, Queensland, Sardegna, Sicilia, South Australia, Spain, Tasmania, Uruguay, Victoria, Western Australia, Zimbabwe as per POWO;

Common name: Fierce Thorn Apple, large thorn-apple, long-spine thorn-apple;

As per efi thread :
The two species can be conclusively differentiated from fruits and seeds. The capsules of D. ferox are on erect stalks, lower spines are much shorter, upper longer, seeds black or grey. In D. inoxia capsules are on recurved stalks, spines almost equally longer, seeds yellow or brown
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Datura ferox, commonly known as Long Spined Thorn Apple or Fierce Thornapple, is a species of Datura. Like all such species, every part of the plant contains deadly toxins that can kill animals (including humans) that ingest it. Its fruit, red-brown when ripe, has unusually long thorns or spikes.

Datura ferox is an upright shrub 1½ to 3 feet high. Its thick stalks often have a red-violet color at the base. All the young shoots are noticeably hairy. The most conspicuous part of the plant is its very wide undulate, irregularly-toothed leaves, which are covered with soft, downy hairs. The yellowish white flowers are funnel-shaped and inconspicuous, and usually do not open completely.^[1]

(From Wikipedia on 26.6.13)
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This was taken by me in Limuru, Kenya during visit in January,2009.
I hope the picture will be useful.
Had seen some flowers close by deep purple color, will post seperately to find out if they are of the same Datura.

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Yes … Looks like D. ferox

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Solanaceae week : Datura ferox:
Datura ferox from Satara

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Thanks for upload. Could you please upload one more photograph of fruit, perhaps a more mature one in close up

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Unfortunately this is the only photo available with me taken few years back. I am attaching the original high resolution photo.

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Datura ferox

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Solanaceae Fortnight::Datura Ferox from Satara Feb- NSJ-05 : 3 posts by 2 authors. Attachments (2)
Datura Ferox from Satara. 

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Solanaceae Fortnight : Datura ferox – Open Fruit : Kenya : 26FEB15 : AK-42 : 1 post by 1 author. Attachments (1).

Saw this open fruit with seeds in Kenya by the roadside.

I think this is close to images and details at Datura stramonium L.

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On further checking, I think it may be Datura ferox, as per images and details herein.

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References:

POWO  The Plant List  Flowers of India  Wikipedia  BSI Flora of India Checklist  Flora of Peninsular India