TWO NEW SPECIES OF THE GENUS VINCETOXICUM (ASCLEPIADACEAE) FROM IRAN

Vincetoxicum assadii and V. mozaffarianii are described as new species from Iran. The differences with related species are also discussed. Probable related species to V. assadii are V. tmoleum Boiss. and V. fuscatum (Hornem.) Rechb. Fil. and those of V. mozaffarianii are V. stocksii Ali & S. Khatoon, V. sakesarense Ali & S. Khatoon and V. amottianum (Wight.) Wight.