I.D Which Bindweed please

[stevecurtis]

Which Bindweed please,thanks for any help.

all the best steve

[Hedera]

Difficult to define. Large or Hedge? The calyx bracts are one method of ID but can't see them in pic. Hedge ones do not overlap.

[Dorts]

Hi Steve. Without seeing the sepals difficult to be sure but I'd go for
Hedge Bindweed - Calystegia sepium.
Dorts.

[Tiggrx]

You can see some calyx-bracts in the background of the picture which look like Large Bindweed (Calystegia silvatica)

[Dorts]

I was tempted with Large Bindweed when I first saw it, but going by what is shown, the flower of Large B. generally goes beyond a 'trumpet' and begins to flop down at the outer edges giving a generally larger flower. Hence the name.
But as we have said so many times before, without the plant in your hand it is very difficult to be certain.
All good fun.
Dorts.

[stevecurtis]

Thanks for the help I will check the calyx bracts ,Dorts mentioned the sepals, what should I be looking for .

All the best steve

[Dorts]

Steve
You should be looking at the calyx. I used the term sepals in error.
Dorts.

[stevecurtis]

Thanks Dorts it is a great help to know the distinguishing features,ive left it late in life for such a subject but im keen to learn.

All the best steve

[TeresaW]

It's never too late to learn, and I've learned with you today. I wasn't sure how to tell the two apart either.

I feel a trip to the river coming on just to see I've got it correct

[AlanS]

To be pedantic, the term folks are searching for here is 'bracteoles' - leaf-like structures at the base of the flower, that in this case more or less hide the true calyx.

The shape of the bracteoles is crucial. In Calystegia sepium the bracteoles normally do not overlap and so leave much of the calyx visible, while in C. silvatica the bracteoles appear inflated, do overlap and hide most or all of the calyx.

From what I can see of the bracteoles on the photograph, this is Calystegia silvatica subsp. disjuncta - the bracteoles are inflated but not as large and convex as they are in C. silvatica subsp. silvatica.

To add further complication, C. sepium and C. silvatica hybridise easily and, locally, as around London, the hybrid is common. I don't know if it is still there, but for many years there has been a large colony of the hybrid by Tottenham Hale undergound station.

Alan