In: Phyton 55, Fasc. 1 (2015): S. 17-29 with 7 figures DOI: 10.12905/0380.phyton55(1)2015-0017

Hypericum robsonii spec. nova sect. Trigynobrathys (Hypericaceae) from the Misiones Province in Argentina
Key words: Hypericum robsonii H. A. Keller & S. Crockett spec. nova, Hypericaceae, Hypericum sect. Trigynobrathys. – New species, taxonomy, ethnobotany, critically endangered species. – Flora of Argentina, Southern Cone.

Keller H. A. & Crockett S. L. 2015. Hypericum robsonii spec. nova sect. Trigynobrathys (Hypericaceae) from the Misiones Province in Argentina. – Phyton (Horn, Austria) 55 (1): 17–29, with 7 figures.

Summary
Plant collections conducted in connection with ethnobotanical studies carried out with the Guaraní peoples of Misiones Province, Argentina, resulted in the discovery of a new species of Hypericum L. (Hypericaceae), which is characterized by its epigeous herbaceous scions produced seasonally from subterranean stems or roots. This species, H. robsonii H. A. Keller & S. Crockett, is described and illustrated for the first time. Information about its ecology, habitat and distribution, phenology and ethnobotany is provided.