Parthenocissus vitacea (Canada)


Parthenocissus inserta from Canada-GS06122021-5: 5 high res. images.
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

POWO gives it as a syn. of Parthenocissus quinquefolia (L.) Planch.
There is another closer taxon as Parthenocissus vitacea (Knerr) Hitchc. as per POWO, with many forms and varieties of Parthenocissus quinquefolia and Parthenocissus inserta as synonyms.

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.

POWO gives it (Parthenocissus inserta) as a syn. of Parthenocissus quinquefolia (L.) Planch.

if you want to follow POWO, list it as P. vitacea
I have written clearly above that there are two different taxa with distinct characters

If you want to follow POWO the two are P. quiquefolia and P. vitacea
If you want to follow WFO the names are P. quiquefolia and P. inserta (syn P. vitacea)
If you want to follow COL (Catalogue of Life) the names are P. quinquefolia and P. vitacea (syn: P. inserta)
You can pick your choice, but the fact remains there are two distinct taxa.

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Parthenocissus inserta from Mississauga, Canada-GS13102020-1 : 4 posts by 2 authors. Attachments (2)

Parthenocissus inserta (A.Kern.) Fritsch
Syn: P. vitacea (Knerr.) Hitchc.
A scrambling climber, usually spreading over trees and walls (closely clinging in P. quinquifolia due to adhesive discs at tips of 6 or more branched tendrils) due to pointed tips of less than 6-branched tendrils usually lacking adhesive tips, leaves lustrous (vs opaque), inflorescence dichotomously branched without central axis (vs infl with central axis with diverging branches), berries 8-12 mm in diam. (vs 5-8 mm diam).
Clicked from along Burnhampthorpe Road, Mississauga, Canada, 29-8-2019.

POWO considers it (Parthenocissus inserta (A.Kern.) Fritsch) to be a syn. of Parthenocissus quinquefolia (L.) Planch.

… we have to decide which database we are following

Flora of North America treats them distinct
World Flora Online treats them distinct
Catalogue of Life treats them distinct
TPL treats them distinct

Thanks, … As we have discussed in the past, none of them can be followed all the time. We have to follow depending on the merit in each case.

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Wild Creeper for ID : Niagara Falls, New York : 30NOV17 : AK-41 : 2 posts by 2 authors. Attachments (3)
Again seen near the falls in June.

Cissus Species?
Cissus pentaphylla?
Experts kindly validate 

Parthenocissus quinquefolia (L.) Planch. ???

If Parthenocissus then it is surely P. inserta
This is what I have been writing on an online forum where, numerous such uploads are being shared.
Leaves lustrous, Please look for tendrils if branches are less than 6 and tips pointed (not with discs), inflorescence dichotomous it could be P. inserta.
If branches six or more with adhesive tips, inflorescence racemose, leaves dull then P. quinquefolia.

It is same !

POWO considers it (Parthenocissus inserta (A.Kern.) Fritsch) to be a syn. of Parthenocissus quinquefolia (L.) Planch.

… we have to decide which database we are following

Flora of North America treats them distinct
World Flora Online treats them distinct
Catalogue of Life treats them distinct
TPL treats them distinct

Thanks, … As we have discussed in the past, none of them can be followed all the time. We have to follow depending on the merit in each case.

.