Accoriding to Plants of the World Online, Cynanchum vanslessenii, Cynanchum stoloniferum, and Cynanchum resiliens appear closely related to each other and to Cynanchum viminale subsp. viminale. The Flora of Somalia includes only Cynanchum viminale subspp. crassicaule and stipitaceum but the treatment ends with the statement that the Cynanchum viminale complex falls into numerous closely related species and subspecies, only two of which have so far been confirmed from [Somaliland and] Somalia. The report of Cynanchum stoloniferium from Somaliland is supported by a specimen being cultivated in the garden of the University of Hargeisa's Biodiversity museum.