1512 Vincetoxicum hirundinaria Medicus

Syn.: Cynanchum vincetoxicum (L.) Pers.

This polymorphic species occurs mainly in Europe and W. Asia. Fl. Eur. 3/1972, p. 72f. reports nine subspecies, each one with a rather distinct distribution area. It has been introduced into eastern N. America. The closely related V. sibiricum (L.) Duch. Is also mapped. Cf. also Meusel et al. 1978, map p. 358.