EPHEDRA
Isolation, analysis, and synthesis of ephedrine and its derivatives
A. N. Gazaliev, M. Zh. Zhurinov, S. D. Fazylov & S. N. Balitskii 
Chemistry of Natural Compounds volume 25, pages261–271(1989)
https://link.springer.com/article/10.1007/BF00597698
type:
http://www.plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:383381-1

OTHER HERBS
https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/grindelia