Rhyssostelma is a species of plants in the family Apocynaceae first described as a genus in 1844.Decaisne, Joseph. 1844. Prodromus Systematis Naturalis Regni Vegetabilis 8: 590 in LatinTropicos, genus Rhyssostelma It contains only one known species, Rhyssostelma nigricans, endemic to Argentina.Zuloaga, F. O., O. Morrone, M. J. Belgrano, C. Marticorena & E. Marchesi. (eds.) 2008. Catálogo de las plantas vasculares del Cono Sur. Monographs in systematic botany from the Missouri Botanical Garden 107(1–3): i–xcvi, 1–3348.The Plant List, Rhyssostelma nigricans Decne.
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