No infraspecifics in POWO
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:267957-1
All varieties are listed as synonyms.

FNA : infraspecific taxa not accepted, var. angustifolius cited in synonymy, the other two variety names not mentioned at all.

Evolvulus alsinoides var. alsinoides has already been inactivated :
https://www.inaturalist.org/taxa/1053197-Evolvulus-alsinoides-alsinoides