Abstract
The distinction between hybrids and species of hybrid origin is significant for plant diversity conservation. Interspecific hybridization within the genus Rosa is a common phenomenon. Based on field observation, we hypothesized that one previously published species, Rosa pseudobanksiae (endangered category: CR) might be a hybrid. In this study, we utilized molecular approaches involving three nuclear markers and four plastid markers to examine the origin of R. pseudobanksiae. Our evidence shows that it is indeed a natural homoploid hybrid between R. banksiae var. normalis and R. multiflora var. cathayensis, and that gene flows bidirectionally. Our multivariate morphometric analyses provide strong evidence for a matrocliny in R. × pseudobanksiae individuals. R. × pseudobanksiae has diverse morphological variations among individuals andshares the overlapped distributions with its parental progenitors. This taxon has not developed into a stabilized and self-evolving lineage with the high sterility in seed sets.
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