Dig deeper at SERNEC, a consortium of southeastern herbaria.

The former Calystegia sepium has now been split out into several species, not to mention all now in the genus Convolvulus. Read more at Vascular Plants of North Carolina.

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Calystegia sepium ssp. americana   FAMILY Convolvulaceae

SYNONYMOUS WITH Vascular flora of Illinois (Mohlenbrock, 2014)

Calystegia sepium ssp. americanum

INCLUDING Vascular flora of Illinois (Mohlenbrock, 2014)

Convolvulus sepium var. americanus

INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 158-06-002:

Calystegia sepium   FAMILY Convolvulaceae

INCLUDING Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)

Convolvulus sepium var. repens

INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)

Convolvulus americanus

INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)

Convolvulus repens

COMMON NAME:
Northeastern Bindweed

NameThatPlant has no pictures at this time. You might try this link: Flora of the Southeastern United States

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (10/20/20):
Convolvulus americanus   FAMILY Convolvulaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Calystegia sepium ssp. americana   FAMILY Convolvulaceae

SYNONYMOUS WITH Vascular flora of Illinois (Mohlenbrock, 2014)
Calystegia sepium ssp. americanum

INCLUDING Vascular flora of Illinois (Mohlenbrock, 2014)
Convolvulus sepium var. americanus

INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 158-06-002:
Calystegia sepium   FAMILY Convolvulaceae

INCLUDING Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Convolvulus sepium var. repens

INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Convolvulus americanus

INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Convolvulus repens