FIELD BINDWEED
Convolvulus arvensis L.
Field Bindweed is a perennial vine growing from an extensive root system.  The leaves are alternate, simple, blunt, arrowhead shape. 

Stems form prostrate, twining mats growing up to 10' in length. 

Flowers are funnel shaped, pale pink to white, up to 1" wide with two small bracts attached below the flower on the stem. 

Roots are creeping rhizomes.

Seeds are dark grey to reddish brown in color, three sided, four to a capsule and can have 60 year viability.
Photos and information adapted from "Weeds of the West" by Tom Whitson