''Rhyssostelma'' is a species of plants in the family

Apocynaceae Apocynaceae (, from '' Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison. Notable mem ...

first described as a genus in 1844. It contains only one known species, ''Rhyssostelma nigricans'',

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 ...

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

.The Plant List, ''Rhyssostelma nigricans'' Decne.
/ref>

References

{{Taxonbar, from1=Q6107852, from2=Q15613606 Monotypic Apocynaceae genera Endemic flora of Argentina Asclepiadoideae