Genetic Diversity of Rumex k-1(Rumex patientia×R.tianschanicus cv.Rumex k-1) and Wild Rumex spp. The application of DNA molecular markers in conservation of the rare and endangered medicinal plants ISSR and SRAP Markers Reveal Genetic Diversity and Population Structure of an Endangered Slipper Orchid, Paphiopedilum micranthum (Orchidaceae)