''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 only 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 foun ...

Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

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