Advances in studies on chemical constituents and pharmacological activities for plants of Gymnadenia R. Br. Quantitative analysis of four active constituents in Tibetan herb Gymnadenia conopsea by high-performance liquid chromatography Construction of a Full-length cDNA Library of Gymnadenia conopsea by Modified Oligo-capping Pollen morphology of Gymnadenia R. Br. (Orchidaceae) and its taxonomic significance Constituents of Gymnadenia conopsea Uniform design for in vitro somatic embryogenesis and plant regeneration of Gymnadenia conopsea