What stem does Baiyunguan watermelon have?

Baiyunguan watermelon is a kind of stalk that regards watermelon as a lifelong companion, and it is a Taoist from Baiyunguan in Beijing. Baiyunguan is located in Baiyunguan Street outside Xibianmen, Xicheng District, Beijing. Founded in the Tang Dynasty, it is a sacred place for Emperor Xuanzong of the Tang Dynasty to worship Laozi, and is famous for observing the ages. Relatively speaking, there are a large number of precious cultural relics in Baiyun Temple, the most famous of which are the "Three Treasures": the Taoist collected in the Ming Dynasty, the statue of Laozi carved in the Tang Dynasty, the stone carvings and inscriptions of Song Xue Dao De Jing by Zhao Mengfu, a great calligrapher in the Yuan Dynasty.