Dendrobium is not called Dendrobium officinale because they are two different plants. Dendrobium is also known as Dendrobium Orchid Rhyme, Immortal Grass, Resurrection Grass, Purple Yingxian Plant, Chlorophytum, Linlan, Forbidden Life, Golden Hairpin Flower and other names, while Dendrobium officinale is also known as: Black knot grass, Yunnan iron bark, iron pipe, etc.