1, different colors: the flower shape of Erhonggu is small, and the individual size of Zhenghonggu is medium. The stalk base of Erhonggu is grayish white on one side, while the stalk base of Zhenghonggu can be seen with purple and pink spots.

2. Different distribution areas: As far as distribution is concerned, wild loam, forests on hillsides and places near lakes are mainly distributed in Henan Province, Hunan Province and Shaanxi Province; At present, Fujian, Guangxi Zhuang Autonomous Region and Yunnan Province are the three places that are abundant and common in market sales centers.