Sir,
subsp. angustifolia photographs O have seen from Africa ...leaves show an
extreme of change in length and width . I do not remember seeing a post
with that extreme variation .
There is variation in corolla color too...near white to deep yellow , and
corolla center with or without maroon color .
There is X. tridentata subsp. alatipes with winged pedicel and winged outer
lobes of calyx .
There is one more variant with lot of hairs .
I shall go through the posts here and on facebook .

On Sun, Oct 13, 2019, 17:49 J.M. Garg <[email protected]> wrote:

> On further checking, however, Flora of peninusular India says that Both
> subspecies are found in south India as per
> Merremia tridentata subsp. hastata
> <http://flora-peninsula-indica.ces.iisc.ac.in/herbsheet.php?id=2892&cat=7> 
> (syn.
> of *Xenostegia tridentata *subsp. *angustifolia* (Jacq.) J. Lejoly & S.
> Lisowski
> <http://www.catalogueoflife.org/col/details/species/id/064ac2cb88ecca6d97d71d7bdabc0456>)
>
> Merremia tridentata subsp. tridentata
> <http://flora-peninsula-indica.ces.iisc.ac.in/herbsheet.php?id=2893&cat=7> 
> (syn.
> of Xenostegia tridentata subsp. *tridentata*)
> <http://www.catalogueoflife.org/col/details/species/id/20117770c72ea9f6ed0ff35b430ea3ac>
>
> Book at Merremia tridentata subsp. hastate
> <http://flora-peninsula-indica.ces.iisc.ac.in/herbsheet.php?id=2892&cat=7> 
> says
> in note that subsp. *tridentata* also occurs in S. India but *has leaves
> and outer sepal obtuse- emarginate*.
>
> On Sun, 13 Oct 2019 at 16:10, J.M. Garg <[email protected]> wrote:
>
>> Catalogue of life
>> <http://www.catalogueoflife.org/col/details/species/id/dfa206ec73043c8d7b409833f6b73c5b>
>> gives three subspecies out of which two are found in India, as per below:
>> *Xenostegia tridentata* subsp. *angustifolia* (Jacq.) J. Lejoly & S.
>> Lisowski
>> <https://mail.google.com/col/details/species/id/064ac2cb88ecca6d97d71d7bdabc0456>
>>  (Saudi
>> Arabia (Asir), South Africa (Limpopo, North-West Prov., Gauteng,
>> Mpulamanga, Free State, KwaZulu-Natal, N-Cape Prov.), Swaziland, Namibia,
>> Botswana, Zambia, Zimbabwe, Malawi, Mozambique, Angola, Kenya, Uganda,
>> Tanzania, Zanzibar, Senegal, Gambia, Guinea, Sierra Leone, Liberia, Ivory
>> Coast, Burkina Faso, Ghana, Togo, Benin, Nigeria, Central African Republic,
>> Cameroon, Congo (Brazzaville), Guinea-Bissau, Gabon, Chad, Sudan, South
>> Sudan, Sao Tome, Burkina Faso, Mali, Mauritania, Ethiopia, Comores
>> (Mayotte, etc.), Madagascar, peninsular Malaysia, Indochina, trop. Asia, 
>> *India,
>> Sri Lanka*, China, Hongkong, Taiwan, Sumatra, Java, Borneo, Sulawesi,
>> Philippines, Lesser Sunda Isl., Moluccas, New Guinea, Australia, Palau Isl.
>> (I) (Babeldaob (I)))
>>
>> *Xenostegia tridentata* subsp. *tridentata*
>> <https://mail.google.com/col/details/species/id/20117770c72ea9f6ed0ff35b430ea3ac>
>>  (China
>> (Guangdong, Guangxi, Hainan, Yunnan), Taiwan, Cambodia,* India (Bengal),
>> Bangladesh*, Indonesia, Laos, *Myanmar [Burma] (Mandalay, Taninthayi,
>> Yangon), *New Guinea, Singapore, *Sri Lanka*, Thailand, Vietnam,
>> Australia (Western Australia, Northern Territory, Queensland), Puerto Rico
>> (I), peninsular Malaysia, Borneo (Natuna Isl., Anambas Isl.), Sumatra
>> (Bangka Isl.), Sulawesi, Moluccas (Aru Isl.), Lakshadweep Isl.
>> (Laccadives), Christmas Isl. (Australia))
>>
>> *Xenostegia tridentata* var. *pubescens* Rendle
>> <https://mail.google.com/col/details/species/id/952fd76b2417b58815c9f9c19b83a632>
>>  (Caprivi
>> Strip, Botswana, Zambia, Mozambique, Kenya, Tanzania)
>>
>> I could not find the difference on net among two subspecies found in
>> India.
>>
>> Based on the distribution, our observations at Xenostegia tridentata
>> <https://sites.google.com/site/efloraofindia/species/a---l/cl/convolvulaceae/xenostegia/merremia-tridentata>
>>  may
>> be of *Xenostegia tridentata* subsp. *angustifolia* (Jacq.) J. Lejoly &
>> S. Lisowski
>> <https://mail.google.com/col/details/species/id/064ac2cb88ecca6d97d71d7bdabc0456>
>>
>> I will correct our page, after getting feedback in this regard, if any.
>> Can anybody give the distinction between the two subspecies ?
>> --
>> With regards,
>> J.M.Garg
>>
>> 'Creating awareness of Indian Flora & Fauna'
>> <http://en.wikipedia.org/wiki/User:Jmgarg1>
>>
>> Winner of Wipro-NFS Sparrow Awards 2014 for efloraofindia
>> <https://sites.google.com/site/efloraofindia/award-for-efloraofindia>.
>>
>> For identification, learning, discussion & documentation of Indian Flora,
>> please visit/ join our Efloraofindia Google e-group
>> <https://groups.google.com/forum/#!forum/indiantreepix> (largest in the
>> world- more than 3,000 members & 3,00,000 messages on 23.8.18) or 
>> Efloraofindia
>> website <https://sites.google.com/site/efloraofindia/> (with a species
>> database of more than 13,000 species & 3,00,000 images of which more than
>> 2,00,000 images are directly displayed on 30.8.19).
>>
>> The whole world uses my Image Resource
>> <http://commons.wikimedia.org/wiki/Category:J.M.Garg> of more than a
>> thousand species & eight thousand images of Birds, Butterflies, Plants etc.
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>> per Creative Commons license attached with each image.
>>
>> Also author of 'A Photoguide to the Birds of Kolkata & Common Birds of
>> India'.
>>
>
>
> --
> With regards,
> J.M.Garg
>
> 'Creating awareness of Indian Flora & Fauna'
> <http://en.wikipedia.org/wiki/User:Jmgarg1>
>
> Winner of Wipro-NFS Sparrow Awards 2014 for efloraofindia
> <https://sites.google.com/site/efloraofindia/award-for-efloraofindia>.
>
> For identification, learning, discussion & documentation of Indian Flora,
> please visit/ join our Efloraofindia Google e-group
> <https://groups.google.com/forum/#!forum/indiantreepix> (largest in the
> world- more than 3,000 members & 3,00,000 messages on 23.8.18) or 
> Efloraofindia
> website <https://sites.google.com/site/efloraofindia/> (with a species
> database of more than 13,000 species & 3,00,000 images of which more than
> 2,00,000 images are directly displayed on 30.8.19).
>
> The whole world uses my Image Resource
> <http://commons.wikimedia.org/wiki/Category:J.M.Garg> of more than a
> thousand species & eight thousand images of Birds, Butterflies, Plants etc.
> (arranged alphabetically & place-wise). You can also use them for free as
> per Creative Commons license attached with each image.
>
> Also author of 'A Photoguide to the Birds of Kolkata & Common Birds of
> India'.
>

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