Asymbiotic Seed Germination and in vitro Seedling Rapid Development of Paphiopedilum spicerianum Mating system and genetic diversity in a small population of perennial wild rice Oryza rufipogon Asymbiotic Seed Germination and in vitro Seedling Rapid Development of Paphiopedilum spicerianum Near Situ Conservation for Wild Plant Species with Extremely Small Populations