''Huperzia serrata'', the toothed clubmoss, is a

plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae excl ...

known as a firmoss which contains the

acetylcholinesterase Acetylcholinesterase ( HGNC symbol ACHE; EC 3.1.1.7; systematic name acetylcholine acetylhydrolase), also known as AChE, AChase or acetylhydrolase, is the primary cholinesterase in the body. It is an enzyme that catalyzes the breakdown of ac ...

inhibitor Inhibitor or inhibition may refer to: In biology * Enzyme inhibitor, a substance that binds to an enzyme and decreases the enzyme's activity * Reuptake inhibitor, a substance that increases neurotransmission by blocking the reuptake of a neurotra ...

huperzine A Huperzine A is a naturally occurring sesquiterpene alkaloid compound found in the firmoss ''Huperzia serrata'' and in varying quantities in other food ''Huperzia'' species, including ''H. elmeri'', ''H. carinat'', and ''H. aqualupian''. Huperz ...

.Xing Zu Zhu, Xiao-Yu Li, Jin Li (2004), "Recent pharmacological studies on natural products in China", ''European Journal of Pharmacology'' 500 221–223 The species is native to eastern Asia (China, Tibet, Japan, the Korean peninsula, the Russian Far East).

References

serrata Flora of China Flora of Eastern Asia Flora of the Russian Far East {{Lycophyte-stub