Resumen

JOCOU, Adriel I.  y  BRIGNONE, Nicolás F.. First record of Juncus articulatus subsp. articulatus (Juncaceae) for the Southern Cone flora. Bol. Soc. Argent. Bot. [online]. 2020, vol.55, n.4, pp.1-10. ISSN 1851-2372.  http://dx.doi.org/https://doi.org/10.31055/1851.2372.v55.n4.29938.

Background and aims: Juncus is the largest and most diverse genus of Juncaceae, distributed mainly in the temperate zones of both hemispheres. The Southern Cone flora contains ca. 38 Juncus species (44 taxa including 12 infraspecific categories). Sixteen of those species belong to the section Ozophyllum. As a part of our ecologic studies in wetlands of Patagonia (Argentina) we collected specimens of Juncus that did not match any of the species currently known to the Southern Cone. The aim of this contribution is to report for the first time the presence of Juncus articulatus subsp. articulatus for the Southern Cone flora. M&M: Classical methods in taxonomy were employed. Living and herbarium material, original descriptions, and type material of Juncus articulatus subsp. articulatus were studied. Collected materials were deposited in the herbarium ARC of the Universidad Nacional del Comahue. Results: Juncus articulatus subsp. articulatus is here described. A distribution map, photos, and a key to the Southern Cone species of Juncus belonging to the section Ozophyllum are provided. Also, some ecological and distributional features are discussed. Conclusions: The naturalization of Juncus articulatus subsp. articulatus is reported here for the first time in the Southern Cone. From now on, Juncus contributes 39 species to the Southern Cone flora, and 17 to Juncus section Ozophyllum.

Palabras clave : Flora of Argentina, Juncus, new record, Ozophyllum, South America, wetlands..

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