A new species and a new replacement name in Cynanchum (Apocynaceae:
Asclepiadeae) from southwest China
Cynanchum pingtaoi sp. nov.
(Apocynaceae), from Yunnan Province, China, is described and illustrated
based on molecular and morphological evidence. Its deeply cordate to
reniform leaves, campanulate and large flowers show that it is a member
of former Raphistemma which has been included in Cynanchum now. It is
different from the all former Raphistemma species (C. hooperianum,C.
longhushanense and C. pulchellum) by the broadly ovate corolla lobe,
purple-red corolla, and connivent corona tip slightly exceeding corolla
throat. Its detailed morphological description and illustrations are
provided. Meanwhile, Cynanchum longhushanense (Y. Wan) G.D.Tang & Miao
Liao nom. nov. is proposed as the replacement name of Raphistemma
brevipedunculatum Y. Wan which is reinstated from a synonym of C.
hooperianum (Blume) Decne because of their significant morphological