Distinctive features:
Leaves have square ends towards the base (see photos).
Similar species: Upright Bindweed (Calystegia spithamaea) - Large white flowers. Leaves not square at base. Eurasian Black Bindweed (Fallopia convolvulus) - Leaves not square at base. Field Bindweed (Convolvulus arvensis) - Smaller white flowers. Leaves have two pointy ends near the base.
PLEASE NOTE: A coloured Province or State means this species occurs somewhere in that Province/State.
The entire Province/State is coloured, regardless of where in that Province/State it occurs.
(Range map provided courtesy of the USDA website
and is displayed here in accordance with their
Policies)