Uma nova espécie de Senna Mill. (Leguminosae - Caesalpinoideae) do Brasil

Abstract

RESUMO(Uma nova espécie de Senna Mill. (Leguminosae -Caesalpinoideae) do Brasil) Senna biglandularis, uma nova espécie pertencente à série Laxiflorae, seção Chamaefistula, proveniente do estado de Tocantins (Brasil) é descrita e ilustrada, incluindo dados de hábitat e fenologia. Dentre os caracteres diferenciais da nova espécie estão a presença de dois nectários extraflorais no pedicelo e pétalas glabras em ambas as faces. Além disso, é apresentada uma chave de identificação de todas as espécies pertencentes à série Laxiflorae. Palavras-chave: Chamaefistula, Laxiflorae, cerrado, Tocantins. ABSTRACT(A new species of Senna Mill. (Leguminosae -Caesalpinoideae) from Brazil) Senna biglandularis, a new species belonging to series Laxiflorae, section Chamaefistula, from Tocantins state (Brazil) is described and illustrated, including comments on habitat and phenology data. The main diagnostic characters of the new species are its pedicel with two extrafloral nectaries and its petals, glabrous on both sides. An identification key for all species included in series Laxiflorae is also presented.

Angiosperms of dry grasslands and savannahs of Jalapão, the largest conserved Cerrado area in Brazil

“…Sampaio, personal communication) except a one-time addendum of new collection efforts bringing the total of plant species for all physionogmies in Jalapão to 463 (Seplan 2003), and a limited number of new collecting expeditions (Proença et al 2007). Nevertheless, a relatively large number of new species have been described from the region or rediscovered there recently (e.g., Proença et al 2007;França & Proença 2007;Araujo & Souza 2007;Yamamoto et al 2008;Rua et al 2008;Vieira & Souza 2008;Devecchi & Pirani 2015;Borges & Antar 2016;Araújo et al 2016;Mendes et al 2017;Moreira et al 2017;Antar et al 2017) highlighting its incomplete floristic knowledge (Proença et al 2007;. Thus, our work represents an important contribution to the understanding of the biodiversity within this botanically underexplored, highly threatened region within the Cerrado domain.…”

Florística e efeitos do regime de fogo no estrato herbáceo−subarbustivo no Jalapão, Tocantins, Brasil

“…In spite of this conservation and protection effort, Jalapão flora is still poorly known ). This is confirmed by the high number of new species being described recently , França and Proença 2007, Araujo and Souza 2007, Yamamoto et al 2008, Rua et al 2008, Vieira and Souza 2008 and the low number of plant collections available in herbaria, as few field expeditions were conducted to date ).…”