Field bindweed, a perennial
Leaves (below). Notice the pointed, flared, ends of the leaf base corners.
Viney field bindweed climbing up a timothy plant (below left) and a wild carrot plant (below right) to capture more light, a good competititve trait for a weed.
Bindweed infesting soybeans and volunteer corn (below, left) and waste areas (below, center and right).
Beautiful field bindweed flowers (below). It is easy to see why humans adapted this species for ornamental use.
Hedge bindweed, a perennial Morningglory
Leaves (below). Notice the flattened area of the leaf at the base of the triangle. Compare this with the flared, sharper, leave points of field bindweed.
Hedge bindweed infesting a corn crop ready to harvest (below).
Differences between hedge bindweed (below, top) and wild buckwheat (Polygonum sp.) (below, bottom):