Leaves in photo are approx 6 inches long and were found at knee height below Poplar and Ash Trees.
No interactions present.
... (Sagittaria sagittifolia) is an aquatic plant. (Or did you intend some other plant of the same name?)
Shouldn't this be called Tamus communis or has some post-Stace 3 change occurred?
... that Stace didn't adopt - "Perhaps better amalgamated with Dioscorea L., which is paraphyletic without it, but very distinct."
Lat/Lng: 52.245, -0.268
OS grid ref: TL183621