I asked my gardener this morning to get rid of this vine which was becoming invasive. I thought it was an ordinary sort of gourd perhaps but it had the most amazing tuberous root. The photo of it only shows about half as he couldn't get the rest of it out of the ground!!! It was growing in dry soil in shade, but we found another plant growing around the roses in the front of the house which is also in dry soil, but in direct sun. We also found another young plant growing amongst ferns by the pond, also dry and shady. That one had a tap root like a parsnip and we got it all out.
Does anyone have any idea what it is?
Leaf & tendril
Tuber (part of)
Part of plant
Flower (sorry, not as sharp a photo as I'd like. It has 5 petals and is creamy white with green stripes.