Evolvulus alsinoides var. hirticaulis Torr.

POWO follows these authorities in synonymising this name:

• Flora of North America Editorial Committee (2023). Flora of North America North of Mexico 14: 1-505. Oxford University Press, New York, Oxford. [Cited as Evolvulus alsinoides.]
• Gray, A. in Gray, A. (1878). Convolvulaceae. Synoptical Flora of North America, edit. 1 2(2): 207-224, 394. [Cited as Evolvulus alsinoides.]
• 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 Evolvulus alsinoides var angustifolius.]
• Van Ooststroom, S.J. (1934). A monograph of the genus Evolvulus. Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht 14: 1-267. [Cited as Evolvulus alsinoides var. debilis.]

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

• Austin, D.F. (1990). Annotated checklist of New Mexican Convolvulaceae. Sida 14: 273-286. [Cited as Evolvulus alsinoides var. hirticaulis.]
• 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 Evolvulus alsinoides var. hirticaulis.]