marrow ?

Just off to he beach 10.30 am. Is this plant a marrow?. It came, is flowering, and is taking over. Flowers last one day, is 6" across. Obviously it will be too late to produce fruit. I have moved some plants to make room for it.

 

Certainly that family....but could be gourd,pumpkin,courgette.....do you have any pics of developing fruits?

 

At the moment SteveW it seems to have only male flowers but if anything developes I shall post. Thanks so far.