Convolvulus sepium var. fraterniflorus Mack. & Bush

POWO follows these authorities in synonymising this name:

• Brummitt, R.K. (1980). Further new names in the genus Calystegia (Convolvulaceae). Kew Bulletin 35: 327-334. [Cited as Calystegia silvatica subsp. fraterniflora.]
• Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Calystegia silvatica subsp. fraterniflora.]
• Kartesz, J.T. in Kartesz, J.T. (1994). Convolvulaceae. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland: 217-221. Timber Press. [Cited as Calystegia silvatica subsp. fraterniflora.]
• Shinners, L. in Correll, D.S. & M.C Johnston (1970). Convolvulaceae. Manual of the vascular plants of Texas: 1241-1261. Texas Research Foundation. [Cited as Calystegia sepium var. fraterniflora.]
• Spaulding, D. in Spaulding, D. (2013). Convolvulaceae. Checklist of Alabama's vascular flora: 137-139. [Cited as Calystegia silvatica subsp. fraterniflora.]

This name was accepted following an alternative taxonomy by these authorities:

• Fernald & Rollins in Fernald, M.L. with R. C. Rollins (1950). Gray's Manual of Botany, 8th edition: 1177-1185. Dioscorides Press. [Cited as Convolvulus sepium var fraterniflorus.]
• Scoggan, H.J. in Scoggan, H.J. (1979). Convolvulaceae. The Flora of Canada 4: 1253-1257. National Museum of Natural Sciences. [Cited as Convolvulus sepium var. fraterniflorus.]