Ipomoea asarifolia ?

Ipomoea asarifolia (Desr.) Roem. & Schult. (syn: Amphione asarifolia (Desr.) Rafin.; Convolvulus asarifolius Desr.; Convolvulus beladambu Spreng.; Convolvulus flagelliformis Roxb.; Convolvulus rugosus Rottl.; Convolvulus urbicus Salzm. ex Choisy; Ipomoea beladamboe Roem. & Schult.; Ipomoea crassifolia Cav.; Ipomoea flagelliformis Steud.; Ipomoea grisebachii Prain; Ipomoea latifolia M. Mart. & Gal.; Ipomoea nymphaeifolia Griseb.; Ipomoea pes-caprae var. heterosepala Chodat & Hassl.; Ipomoea repens Lam.; Ipomoea rugosa (Rottl.) Choisy; Ipomoea urbica (Salzm. ex Choisy) Choisy; Ipomoea urbica var. muricata Choisy) ?;        

 
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https://08511630493324166816.googlegroups.com/attach/c75ae323e4aad/DSC_0517_1_web.jpg?part=0.4&view=1&vt=ANaJVrFGnkdaG3YWzmv7BaqP-38HU0Tl8hjhOPPQZ7X_IfbjKmqAXU7Q8amJYqLqtH8KAZzjDb116MrZqNxM5AV5842_a4HHTagz29HiJQ5tjPfUYBV3AE8
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Identification of Ipomoea sp. : 16 posts by 4 authors. Attachments (4)
Pl help me to identify the attached specimen of Ipomoea, a slender creeper found near Karaikudi, Tamilnadu. It was trailing on the ground. 
Does not seem to match with any species in efi as per comparative images at Ipomoea
We needs the dimensions of the flower
As the place is far away from my residence, require one night travel, I will try to provide the details in due course.
Could it be Rivea ornata?!
Thank you ...
1. The plant observed is not an erect undershrub or shrub and the branchlets are not white tomentose. But it is like a (prostrate) climber with long internodes and tendency of rooting at the nodes.
2. The Peduncle is longer than the petiole.
I attach the specimen in high resolution which will help to examine the parts by zooming.
Attachments (2)
Any Rivea species (wild) ?   
The flowers resemble Rivea hypocrateriformis flowers. Hence it could be a Rive species (wild) ?     
I beg to disagree again. 
Rivea hypocrateriformis flowers are having long and narrow corolla tube, narrow throat and sudden flaring of limb. 
Here the case is opposite. 
Can it be Ipomoea pes-caprae subsp. brasiliensis?
I base this guess on two facts ..........
.......subsp. brasiliensis is said to have leaves only slightly notched and not deeply lobed . 
And, Ipomoea pes-caprae does have white variants, or, rather flower color varies from white to deep pink and in between.
Also, variation in leaf bearing and leaf morphology is a strong characteristic of this species.   
I have examined the photos and my impression is that the plant is either Ipomoea pes-caprae or Ipomoea asarifolia, although I am leaning towards the latter of the 2.
The measurements of Ipomoea pes-caprae and Ipomoea asarifolia in various treatments are almost identical with the exacerbation of the length of the peduncle which can be :
I.asarifolia  - 2-5.5 cm / 1 to 2 inch or 1 to 4 inches - depending on treatment
I.pes-caprae  - 4-14cm 1.5 to 7.5 inch
Can any of the viewers  determine the exact length of the peduncle by viewing the photo...I am unable to...
The sepals of Ipomoea asarifolia are noted for being warty, typically more so than what would be seen in Ipomoea pes-caprae, and the sepals on the plant look more warty than not to my eye...
The leaf shape could also match either I.asarifolia or I.pes-caprae, although in my personal reference files, I have more examples of I.asarifolia with the type of leaf shape displayed on the plant in question and I do have examples from various areas of the New and Old World...
The seeds are of course smooth and smaller in I.asarifolia as compared to I.pes-caprae which are always very tomentose, although we do not have the luxury of that feature available to us at this point in time.
So, the location of the plant is the last factor which tends to support an ID of Ipomoea asarifolia because of the inland location, since Ipomoea pes-caprae is almost always located just above the high tide line and only rarely found far from the salt-water shore...
My assessment is Ipomoea asarifolia, although I would welcome any input and/ or evidence to the contrary.
Many thanks for your opinion on the ID of this plant. I appreciate your kind response!
When ... had posted these photos in Indian Flora FB group, I had suggested I. asarifolia as a possibility, along with I. imperati. Further perusal on the ID led me to consider about I. pes-caprae subsp. brasiliensis
Only point I want to highlight here is, I am observing in few places Ipomoea pes-caprae being used by gardeners in Urban landscaping in private homes and there growth is vigorous  ...........typically , they make it climb on roof of barn shades. I'll not be surprised if I encounter an escapee.
Characters of  Ipomoea pes-caprae subsp. brasiliensis  do not tally completely.The flowers do resemble Rivea
Thanks to all for having participated in the identification.
If possible I will try to furnish the dimensions of the various parts, in due course. 


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