''Siamanthus'' is a genus of plants in the ginger family,

Zingiberaceae Zingiberaceae () or the ginger family is a family of flowering plants made up of about 50 genera with a total of about 1600 known species of aromatic perennial herbs with creeping horizontal or tuberous rhizomes distributed throughout tropical ...

. It contains only one known species, ''Siamanthus siliquosus'',

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...

and first described in 1998.Kew World Checklist of Selected Plant Families
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References

Alpinioideae Endemic flora of Thailand Monotypic Zingiberales genera Zingiberaceae genera {{Zingiberales-stub