Taxonomia de Paspalum L., grupo Linearia (Gramineae - Paniceae) do Brasil

Abstract

-(Taxonomy of Paspalum L., Linearia group (Gramineae -Paniceae) from Brazil). A systematic treatment of the Brazilian species of Paspalum tradicionally included in the informal group Linearia is provided, including the critical analysis of each species and of their synonymy, as well as considerations on the consistency of the group and its relationships with the adjacent Notata group. An analytical key is presented to diferentiate the taxa under treatment, including very similar species of the Notata group. Detailed morphological descriptions, illustrations, geographic and ecological data, and chromosome numbers are provided. Seven species are treated in detail: Paspalum approximatum, P. crispulum, P. dedeccae, P. ellipticum, P. filifolium, P. lineare and P. pallens. Paspalum ellipticum and P. pallens are not considered as very typical members of the Linearia alliance.RESUMO -(Taxonomia de Paspalum L., grupo Linearia (Gramineae -Paniceae) do Brasil). Apresenta-se um tratamento sistemático das espécies brasileiras de Paspalum L., grupo Linearia e discute-se a naturalidade do mesmo. O tratamento engloba sete espécies, P. approximatum, P. crispulum, P. dedeccae, P. ellipticum, P. filifolium, P. lineare e P. pallens, incluindo chave analítica para os táxons do grupo e espécies afins, descrições detalhadas, sinonímia, ilustrações, dados sobre ecologia, números cromossômicos e distribuição geográfica, além de discussões sobre a delimitação do grupo. Paspalum ellipticum e P. pallens não são considerados como membros típicos do grupo Linearia.

Genetic Diversity Among Paspalum L. Species (Poaceae) Belonging to the Notata and Linearia Groups Based on Restriction Fragment Length Polymorphism Analyses

“…All species except P. dedeccae were classified in the Notata group by Canto- Dorow et al (1996). The species P. dedeccae was placed in the Linearia group by Oliveira and Valls (2002) but appears related with the Notata group in the dendrogram. P. ionanthum and P. dedeccae displayed the same restriction pattern and are very similar in their leaf shape.…”

“…The great variety of cytological features, in addition to the morphological diversity has lead taxonomists to propose an infrageneric classification of the genus based on affinities among species (Canto-Dorow et al, 1996;Pozzobon et al, 2000;Oliveira & Valls, 2002). However, several species are difficult to classify due to their morphological similarities.…”

“…The present work is focused on the species belonging to Notata and Linearia groups, which include a number of species that have been classified alternatively in either group by different authors (Canto Dorow et al, 1996;Oliveira & Valls, 2002). The Notata group presented here is based on Canto- Dorow et al (1996) and includes nine species, and the Linearia group is sensu Oliveira & Valls (2002), with seven species.…”

“…The Notata group presented here is based on Canto- Dorow et al (1996) and includes nine species, and the Linearia group is sensu Oliveira & Valls (2002), with seven species. Chase (1929) considered the Linearia group as consisting only of the species P. lineare Trinius.…”

Panicoideae (Poaceae) de Ilha Grande, Piauí, Brasil

“…Estudos sobre a taxonomia, ecologia e fenologia desta subfamília para o Brasil foram realizados por diversos autores, como por exemplo Renvoize (1984), Longhi-Wagner (1987), Silva (2000), Oliveira & Valls (2002, Viana & Filgueiras (2008), Dias-Melo et al (2009, Maciel et al (2009Maciel et al ( , 2010Maciel et al ( , 2014, Longhi-Wagner (2012), Oliveira et al (2013) e Pimenta et al (2012). Há poucos tratamentos da diversidade natural de Poaceae no Piauí, os que enfocam especificamente as espécies do estado, ou de regiões dentro do estado, são Nascimento & Renvoize (2001), Filgueiras et al (2014) e Andrade et al (2012), este ultimo sendo um precursor ao presente estudo.…”