Garg ji all three databases treat them as distinct taxa
One P. quinquefolia and another P. vitacea (syn: P. incerta)
Earlier it was known as P. vitacea then P. incerta, and now again as P. 
vitacea.

On Friday, December 17, 2021 at 9:26:24 PM UTC+5:30 JM Garg wrote:

> POWO <https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:184091-2> 
> gives it as a syn. of *Parthenocissus quinquefolia *(L.) Planch.
> There is another closer taxon as *Parthenocissus vitacea* (Knerr) Hitchc. 
> as per POWO 
> <https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:184109-2>, 
> with many forms and varieties of *Parthenocissus quinquefolia* and 
> *Parthenocissus 
> inserta* as synonyms.
>
> On Mon, 6 Dec 2021 at 18:13, Gurcharan Singh <[email protected]> wrote:
>
>> Pathenocissus inserta often confused with P. quinquefolia but 
>> differentiated by lustrous leaflets (not opaque), tendrils with less than 
>> six branches (not six or more), tips of tendril branches pointed (not with 
>> discs) and dichotomous inflorescence (not racemose). photographed from 
>> along Burnhampthorpe Rd Mississauga, Canada, 29-8-2019
>>
>>
>>
>>
>> Dr. Gurcharan Singh
>> Retired  Associate Professor
>> SGTB Khalsa College, University of Delhi, Delhi-110007
>> Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
>> https://www.gurcharanfamily.com/
>>
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>
>
> -- 
> With regards,
> J.M.Garg
>

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