Uma nova espécie de Randia (Rubiaceae, Gardenieae) para o estado do Rio de Janeiro, Brasil

Neto, Sebastião José da Silva; Ávila, Rubem Samuel de

doi:10.1590/2175-7860200758402

Cited by 7 publications

(1 citation statement)

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“…Los estudios más recientes en Randia tienen un carácter regional, enfocado en la taxonomía del género en el Cono Sur de América o adicciones a la flora de Brasil. Se destaca la revisión del género en Argentina, (Judkevich et al 2015) y descripción de tres nuevas especies (Judkevich et al, 2016(Judkevich et al, , 2020Silva & Neto, 2007).…”

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Sinopsis de Randia (Rubiaceae) de Bolivia

Salas

2021

Bol. Soc. Argent. Bot.

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Introducción y objetivos: Randia es un género neotropical con ca. 90 especies, perteneciente a la tribu Gardenieae. A diferencia de las especies centroamericanas, las especies sudamericanas permanecen imperfectamente conocidas. El estudio taxonómico previo de Randia en Bolivia tiene más de 90 años, y en él se citaban solo cinco especies, aportes posteriores fueron checklists regionales. El objetivo del presente trabajo es realizar una sinopsis del género para Bolivia, en continuidad con estudios previos. M&M: Se emplean métodos clásicos en taxonomía. Se estudian materiales vivos y de herbario, descripciones originales y tipos nomenclaturales de las especies bolivianas de Randia. Las especies imperfectamente conocidas se describen en su totalidad, de lo contrario, solo se mencionan sus caracteres diagnósticos y comparaciones con taxones morfológicamente más cercanos. También se ilustran las nuevas especies. Resultados: En base al presente estudio, 12 especies de Randia habitan Bolivia: Randia altiscandens, R. boliviana, R. calycina, R. micracantha y R. obovata, fueron previamente citadas, R. tayloriana y R. claesii son nuevas especies, R. mollis, es una nueva combinación de Basanacantha mollis, R. oblanceolata es restablecida como especie válida, mientras que R. pubiflora, R. brevituba, y R. nitida son nuevas citas para el país. En base a los especímenes analizados en el presente estudio, no se pudo confirmar por el momento la presencia de R. armata para Bolivia. Conclusiones: Este es el primer estudio taxonómico para el género Randia en Bolivia después de 90 años, el cual, a pesar de representar un avance en su conocimiento, aun subestima el número de especies en ese país y numerosos especímenes permanecen sin estudiar.

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Section: Introductionunclassified

Sinopsis de Randia (Rubiaceae) de Bolivia

Salas

2021

Bol. Soc. Argent. Bot.

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Frequency of visits and efficiency of pollination by diurnal and nocturnal lepidopterans for the dioecious tree Randia itatiaiae (Rubiaceae)

Ávila

Freitas

2011

Aust. J. Bot.

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In plants pollinated by different groups of animals, the most frequent visitors may not be the most effective for fitness because of their differential efficiency in pollen transfer. We addressed this question by studying a rare dioecious species of Rubiaceae in Brazil. The flowers of Randia itatiaiae are gender-heteromorphic and hypocrateriform with greenish corolla tubes ~2 cm long, and exhale a strong sweet scent during the entire period of anthesis, which starts at sunset for female flowers. Sucrose was the dominant or co-dominant nectar sugar for both genders. In spite of these typical sphingophilous-phalaenophilous traits, the flowers last for 6 days, and nectar was available in both diurnal and nocturnal assessments. Moreover, the flowering of R. itatiaiae did not overlap the phenodynamics of the Sphingidae community. Accordingly, two functional groups of Lepidoptera – Hesperiidae during the day and Sphingidae and Noctuidae at night – visited the flowers. Visits by either group resulted in equivalent fruit set and seed number per fruit, although the frequency of visits to flowers was higher during the day than at night. Diurnal and nocturnal lepidopterans may exert similar pressures on floral morphology, in addition to divergent pressures on other characters, such as the temporal dynamics of anthesis and nectar production. The pollination system of R. itatiaiae is specialised at the coarse scale, because its floral morphology precludes pollination by animals other than lepidopterans; however, its floral phenotype also represents a generalist compromise between the conflicting pressures exerted by diurnal and nocturnal groups of lepidopterans.

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Rubiaceae in Brazilian Atlantic Forest remnants: floristic similarity and implications for conservation

Paiva

Barberena

Lopes

2016

RBT

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The Atlantic Forest presents great biological complexity and high richness and endemism levels, but it is one of the most threatened phytogeographic domain on the planet. Brazil is one of the Rubiaceae diversity centers in the Neotropics. The relevance and representativeness of the Rubiaceae family in the Atlantic Forest is highlighted in floristic composition studies and tropical forest community structures. However, despite the urban expansion in the state of Rio de Janeiro, we still find large areas of continuous vegetation with high connectivity degree. Recently, Rubiaceae flora and floristic surveys were conducted in Restinga and forest areas of Rio de Janeiro state protected by Conservation Units. New Rubiaceae species also have been described in the fluminense flora and they showed localized distributions and small populations. The current paper analyzes the floristic composition of the Rubiaceae in eight Atlantic Forest remnants in the State of Rio de Janeiro - Área de Proteção Ambiental de Grumari, Área de Proteção Ambiental Palmares, Parque Estadual da Serra da Tiririca, Parque Nacional do Itatiaia, Parque Nacional de Jurubatiba, Reserva Biológica de Poço das Antas, Reserva Biológica do Tinguá e Reserva Ecológica de Macaé de Cima - using the PAST software ("Paleontological Statistics") with Sørensen coefficient. Low similarity levels were found due to the habitats’ heterogeneity. Restinga and forest remnants formed distinct groups. The dendrogram showed the formation of three groups, but only Área de Proteção Ambiental de Grumari and Parque Nacional de Jurubatiba (Restinga areas) showed strong bootstrap support (98%). The current study pointed out 19 micro endemic species from the Atlantic Forest, thus conservation strategies were herein discussed. Discrepancies between the Catalogue of Flora of Rio de Janeiro and the Red Book of Brazilian Flora (two of the main reference catalogs of Brazilian flora) have been identified. We also highlight the need for recollecting microendemic species from the Atlantic Forest. We have suggested developing the Red Book of Endangered Species Plant of the State of Rio de Janeiro and launching research projects based on the phylogeographic approach and on conservation biology to faster broadcast information about species that face restricted distribution in the Atlantic Forest.

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Uma nova espécie de Randia (Rubiaceae, Gardenieae) para o estado do Rio de Janeiro, Brasil

Abstract: RESUMO Uma nova espécie de Rubiaceae para a Floresta Atlântica do estado do Rio de Janeiro é descrita e ilustrada baseada em recentes coleções procedentes do Parque Nacional do Itatiaia.

Cited by 7 publications

References 3 publications

Sinopsis de Randia (Rubiaceae) de Bolivia

Sinopsis de Randia (Rubiaceae) de Bolivia

Frequency of visits and efficiency of pollination by diurnal and nocturnal lepidopterans for the dioecious tree Randia itatiaiae (Rubiaceae)

Rubiaceae in Brazilian Atlantic Forest remnants: floristic similarity and implications for conservation

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