Resumen Miguel, L. M.; S. V. Sobrado & E. L. Cabral. Aportes para la Flora de Argentina: lectotipificaciones, nuevos sinónimos y registros en Borreria (Rubiaceae). Darwiniana, nueva serie 10(2): 404-416. Como parte de los avances en los resultados del Proyecto Flora Argentina sobre la familia Rubiaceae, se presentan novedades taxonómicas y nomenclaturales de especies del género Borreria. Se designan lectotipos para cinco nombres: B. advena, B. asclepiadea, B. brachystemonoides, B. dasycephala y B. staurochlamys. Se propone a B. quadrifaria como un nuevo sinónimo de B. rubrostipulata, y a B. advena de B. dasycephala; además se presenta una nueva combinación, B. orinocensis. Tres especies: B. alata, B. cupularis y B. remota, se citan como nuevos registros para la flora, los cuales son ilustrados y representados en un mapa de distribución. Por último, se presenta una clave taxonómica actualizada de las especies de Borreria que habitan en la Argentina.

Abstract Miguel, L. M.; S. V. Sobrado & E. L. Cabral. Contributions to the Argentinian Flora: lectotypifications, new synonyms and records in Borreria (Rubiaceae). Darwiniana, nueva serie 10(2): 404-416. As part of the advances in the results of the Flora Argentina Project about the family Rubiaceae, taxonomic and nomenclatural novelties in species of the genus Borreria are presented. Lectotypes are designated for five names: B. advena, B. asclepiadea, B. brachystemonoides, B. dasycephala, and B. staurochlamys. B. quadrifaria is proposed as a new synonym of B. rubrostipulata, and B. advena of B. dasycephala; in addition, a new combination is presented, B. orinocensis. Three species: B. alata, B. cupularis, and B. remota, are cited as new records for the flora, which are illustrated and represented on a distribution map. Finally, an updated key to Borreria species that grows in Argentina is presented.

ABSTRACT Diacrodon is a monotypic genus of the tribe Spermacoceae (Rubiaceae), endemic to northeastern Brazil. Diacrodon compressus is frequently misidentified with a two lobed calyx species of Borreria, B. verticillata. Traditionally, in Spermacoceae the fruit type was considered a diagnostic character among the genera. In this sense, D. compressus presents a strongly compressed, one seeded and indehiscent fruit (vs. globose, two seeded and dehiscent fruit in B. verticillata). In this work, we address two objectives: evaluate the systematic position and determine the identity of Diacrodon in respect to other taxa. Molecular analyses using ITS and ETS indicate that D. compressus is strongly related to other species of Borreria. The morphological results revealed that D. compressus, despite of its type of fruit, is identical to Borreria in floral and palynological features. As conclusion, the new combination Borreria diacrodonta is made and a lectotype is designated. An updated description of the species and a key to the Borreria species with a two lobed calyx are provided. The distribution of B. diacrodonta is extended to Brazilian states Goiás and Minas Gerais, and Paraguay. By this taxonomical change it has become clear that the dehiscence of the fruits lack taxonomic value in the delimitation of Borreria.

Resumo Este estudo compreende as espécies de Rubiaceae que ocorrem sobre canga na Serra dos Carajás, estado do Pará, Brasil, incluindo chaves de identificação, descrições detalhadas, ilustrações e comentários morfológicos das espécies, bem como a sinonimização de dois nomes (Chomelia parvifolia e Tocoyena bullata). No total, foram registradas 48 espécies em 24 gêneros, entre as quais distinguem-se, em ambientes abertos, táxons da tribo Spermacoceae, com um gênero monotípico endêmico da região, Carajasia cangae, bem como diversas espécies de distribuição restrita (e.g., Borreria carajasensis, B. elaiosulcata, B. heteranthera e Mitracarpus carajasensis). Nos ambientes florestais encontrados sobre canga, o gênero com maior número de espécies é Psychotria (9 espécies).

Abstract The present study comprises the Rubiaceae that occur on iron-stone (canga) at Serra dos Carajás, estado do Pará, Brasil, including identification keys, detailed descriptions, illustrations and comments regarding the species found, as well as the synonymization of two names (Chomelia parvifolia and Tocoyena bullata). A total of 48 species distributed in 24 genera were recorded, with a predominance of members from tribe Spermacoceae in the open areas, including a monotypic endemic genus, Carajasia cangae, as well as several species with restricted distribution (e.g., Borreria carajasensis, B. elaiosulcata, B. heteranthera and Mitracarpus carajasensis). The genus Psychotria, with nine species treated, had the highest number of species found mostly in the forest groves on canga substrate.