Surveying the origin and biological characteristics of Stephania brachyandra (Diels) gene sources in Thai Nguyen

This study focuses on the biological characteristics of the genetic resources of the Stephania brachyandra in Thai Nguyen, one of Vietnam's valuable medicinal plants currently at risk of extinction. Investigation results indicate that Stephania brachyandra is commonly found at an average density of 32.57 plants per square kilometer, with distribution density varying across districts, being highest in Vo Nhai district and lowest in Phu Luong district.