Introduction to the graminium group: The graminium is a vine of the butterfly family, also known as the white-flowered oleifera vine and the sparrow flower. It blooms from March to April every year, with cluster-like flower spikes growing directly on the vines. The flower shape resembles a bird, and hanging in a string looks like a bird flying. In the blooming season, the grass bird flowers are hung in strings, growing directly on the vines. Each string contains twenty or thirty flowers, connected by a small green vine. When in full bloom, the grass bird flowers hang under the old vines and old trees, looking like thousands of grass bird flowers. The grass sparrows perch under the thick shade in the forest, which is a wonderful sight.