Hypericum robsonii spec. nova sect. Trigynobrathys (Hypericaceae) from the Misiones Province in Argentina

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.