Héctor A. Keller

Ruehssia cundurango is a species of plant of the genus Ruehssia native to Colombia, Ecuador and Peru in South America. It has the common name condurango. The subspecies Ruehssia cundurango subsp. cundurango (synonym Marsdenia cundurango) is known to contain conduritol, a cyclitol or cyclic polyol. It was first isolated in 1908 by K. Kübler from the bark of the vine.

Topea is a genus of flowering plants belonging to the family Apocynaceae. Its native range is Northeastern Argentina. Species: Topea micrantha (H.A.Keller) H.A.Keller Topea patens (H.A.Keller) H.A.Keller

Cristobalia is a genus of flowering plants in the dogbane family (Apocynaceae). It includes four species which are native to Bolivia, Paraguay, southern Brazil, Uruguay, and northern Argentina in South America. Cristobalia australis (Malme) H.A.Keller & Liede – southern Brazil, northern Argentina, and Uruguay Cristobalia bella Morillo, H.A.Keller & S.A.Cáceres – northeastern Argentina (Corrientes and Misiones) Cristobalia hirsutissima (Schltr.) Morillo, S.A.Cáceres & H.A.Keller – southwestern Bolivia and northwestern Argentina (Salta) Cristobalia hispida (Hook. & Arn.) H.A.Keller & Liede –

Chloropetalum is a genus of flowering plants in the dogbane family, Apocynaceae. It includes five species native to the tropical Americas, ranging from Honduras through Central America and tropical South America to northeastern Argentina. Chloropetalum brasiliense Morillo Chloropetalum denticulatum (Vahl) Morillo Chloropetalum obtusiflorum (Decne.) Morillo Chloropetalum surinamense (Jonker) Morillo Chloropetalum viride (H.A.Keller & S.A.Cáceres) Morillo

Caa balansae is a species of flowering plant in the dogbane family, Apocynaceae. It is the sole species in genus Caa. It is a liana native to Paraguay to Misiones Province of northeastern Argentina.

Brargentina bornmuelleri is a species of flowering plant in the dogbane family, Apocynaceae. It is a perennial native to Paraguay, northeastern Argentina, and southern Brazil. It is the sole species in genus Brargentina.

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Caa balansae is a species of flowering plant in the dogbane family, Apocynaceae. It is the sole species in genus Caa. It is a liana native to Paraguay to Misiones Province of northeastern Argentina.

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