Piper attenuatum

Piper attenuatum Buch.-Ham. ex Miq., Syst. Piperac. 306 1843. (syn: Chavica diffusa (Vahl) Miq.; Piper attenuatum Buch.Ham. ex Wall.; Piper diffusum Vahl; Piper karok Blume; Piper malamiris Roxb.)?;  

New Guinea (alpine), Java, peninsular Malaysia, China (Yunnan), India, Myanmar [Burma] (Kachin, Mandalay, Sagaing, Yangon), Bhutan, Sikkim, Bangladesh as per Catalogue of life;

Assam, Bangladesh, East Himalaya, Jawa, Myanmar, Philippines as per POWO;
PIP-er or PYE-per -- an old name for pepper ... Dave's Botanary
at-ten-yoo-AY-tum -- thin, weak ... Dave's Botanary 

Agumbe :: Piper FOR ID :: DVJAN57
: 6 posts by 3 authors. 4 images.
Agumbe ... Dakshina Kannada, Karnataka
Date: 26 DEC 2014 ... Altitude: about 700 m
Piper ¿ species ? ... (family: Piperaceae) 
Piper - species in eFIoraofindia (with details/ keys from published papers/ regional floras/ FRLHT/ FOI/ efloras/ books etc., where ever available) 
Piper is a very tough genus , it very difficult to identify from photographs. This may be probably (?) the male plants of Piper attenuatum- if it is glabrous and the leaf with attenuate base.
If the entire plant is hairy it can be Piper hymenophyllum.
While sending photos please send information on salient morphological features too.  
Thank you very much ... for resurfacing this query.
Thank you very much ... I agree with ... that we cannot arrive to any ID in case of many plants if relevant aspects are not illustrated.
This post does not have relevant photos to resolve ID.
Requesting ... to close this thread.
Piper attenuatum Buch.-Ham. ex Miq. 

Forwarding again for Id assistance please.

As per POWO, Piper attenuatum Buch.-Ham. ex Miq. does not have any distribution in India.
Even this taxa itself does not find any mention in the following:
Nomenclatural notes on Piper Linn. (Piperaceae) from India - PRASANTA KUMAR MUKHERJEE- Phytotaxa 289 (2): 188–192, 2017
Abstract More than a century ago, the comprehensive account of the Piperaceae in the Flora of British India by Hooker (1886) listed 45 species of Piper (including Pothomorphe) and ten species of Peperomia from India, Bangladesh, Myanmar, Nepal, Philippines, Sri Lanka as well as the Indonesian islands Java and Sumatra. The genus Piper was treated under six sections, wherein he listed 28 species from present day India. Several years later, C. de Candolle (1923) recognized 95 species of Piper and eight of Peperomia from India, including 41 species of Piper that were new, although they were not described fully until 1925. A number of new species and varieties were also added by Van Heurck & Müller Argoviensis (1871), C. de Candolle (1910, 1912), Gamble (1924), Ravindran et al. (1987), Babu et al. (1993), Gajurel et al. (2001 a & b, 2007), Lekhak et al. (2012), and Mathew et al. (2016). In the meantime, some regional accounts of the genus Piper were also published, including Rahiman & Nair (1987) from Karnataka, Gajurel et al. (2002, 2008) from Arunachal Pradesh, and Das et al. (2010) from Terai Duars, Darjeeling, and Sikkim. Long (1984) published an account of Piperaceae from Bhutan that included records from Sikkim, wherein he suggested some new synonyms. A critical examination of these publications points to their limitations concerning some of the identities and nomenclature.
Nomenclatural notes on Piper Linn. (Piperaceae) from India II - PRASANTA KUMAR MUKHERJEE- Phytotaxa 338 (1): 017–032, 2018
Abstract In continuation of the taxonomic study of the genus Piper from India (Mukherjee, 2017), eighty-four Piper names, reported from India, are considered here for their typification, identity, and nomenclature. The scrutiny led to the recognition of twenty-four species. Thirty-five synonyms are proposed as new ones out of sixty-one treated here. Lectotypes are designated for almost all the species recognised here together with their synonyms or basionyms. Holotypes are mentioned when applicable. Of particular mention are P. hookeri and P. sylvaticum with confused identities and lacking proper typification. Corrections are suggested to earlier lectotypifications for P. hymenophyllum and P. rhytidocarpum. Extension of distribution to India from Myanmar are recorded for three species: P. acutistigmum, P. leptostachyum and P. pothoides.
According to POWO and CoL it has distribution in India!
I mean to say:
As per POWO, Piper attenuatum Buch.-Ham. ex Miq. does not have any distribution in S.India.
But the other link says it exists in "mainly found in southern part of India"
Which other link ?
I have already mentioned reliable documents based on publications .... 
I have got these with me.
I feel the pics are that of P. attenuatum. This is the most common species found in the Western Ghats, especially at lower elevations.
Thanks, ... But why this taxa itself does not find any mention in the following: ...

I am not a taxonomist to answer all your doubts. I am an agricultural scientist engaged in the collection, study and breeding of pepper and conservation of genetic resources. Retired long back, and no more involved in active research My interests are now different. 
Still, The species can be found in Gambles Flora (Flora of Madras Presidency), as well as in the floras of Wynad, Idukki and Pathanamthitta districts. TBGRI collected it from South Western Ghats and the species is available there. I carried out the chemical studies but do not have the information with me. I have also carried out the genetic relationship studies using clustering analysis and principal component analysis. This is related closely to Piper argyrophyllum, the difference is in the pubescence of the latter. 
Sorry, I am unable to tell more as  I do not have any documents with me. One Dr KV Saji (IISR, Calicut, 673012)  has done the molecular taxonomic analysis. 
Id as Piper argyrophyllum may be correct as per GBIF specimens:
POWO gives its distribution in SW. India, Sri Lanka.
Distribution of Piper attenuatum in India: West Benglal, Sikkim, Assam, Meghalaya, Arunachal Pradesh, Tamilnadu, Kerala, & Karnataka and also Bhutan, Myanmar and China.
Please refer to Nomenclatural Notes on Piper (Piperaceae) III. BY Prasanta Kumar Mukherjee Phytotaxa  441(3):p. 2-3. 2020.
Thank you very much ... for analysing and following up on validating this ID.
Going through the discussion, if I am not mistaking, the ID, I assume is concluded as Piper attenuatum.
Just to get some clarification !
Attachments (3)

Yes, ..., We should go by Expert advice of Dr. Ravindran and Dr. Mukherjee.
I further checked in GBIF and it seems to match as per specimen.

ANFEB40 Piper attenuatum (Please validate)
: 1 post by 1 author. Attachments (5)
This was earlier identified in ... post as Piper attenuatum, Please validate.
Family: Piperaceae
Date: 26th December 2014
Place: Agumbe, Karnataka
Habit: Climber

via Species‎ > ‎P‎ > Piper attenuatum Buch.-Ham. ex Miq. ... family: Piperaceae 
Flowers of India Discussions at efloraofindia more views in flickr more views on Google Earth
PIP-er or PYE-per -- an old name for pepper ... Dave's Botanary
at-ten-yoo-AY-tum -- thin, weak ... Dave's Botanary 
commonly known asflat-branched pepperoval-leaved pepper plant • Malayalamകാട്ടുമുളക് kattumulaka • Tamilஅரேணுகம் arenukamகாட்டுமிளகு kattu-milaku 
botanical namesPiper attenuatum Buch.-Ham. ex Miq. ... synonyms: no synonym known ... The Plants List (2013). Version 1.1. 
December 26, 2014 ... Agumbe