On the interspecific hybridization in eurasian species of Cypripedium (Orchidaceae) and taxonomic status of C.ventricosum

摘要

The hybrid origin of Cypripedium ventricosum (C.calceolus x C.macranthon) is confirmed as a result of morphometric and genetic investigations. Most of the individuals of C.ventricosum proved to be the first-generation hybrids (F_1), backcrosses with C.calceolus (B_1) occur very rarely. Formation of next-generation hybrids is hindered by a considerable pollen sterility in C.ventricosum.