RESUMO
Chamaecrista belongs to subtribe Cassiinae (Caesalpinioideae), and it comprises over 330 species, divided into six sections. The section Xerocalyx has been subjected to a profound taxonomic shuffling over the years. Therefore, we conducted a phylogenetic analysis using a cpDNA trnE-trnT intergenic spacer and nrDNA ITS/5.8S sequences from Cassiinae taxa, in an attempt to elucidate the relationships within this section from Chamaecrista. The tree topology was congruent between the two data sets studied in which the monophyly of the genus Chamaecrista was strongly supported. Our analyses reinforce that new sectional boundaries must be defined in the Chamaecrista genus, especially the inclusion of sections Caliciopsis and Xerocalyx in sect. Chamaecrista, considered here paraphyletic. The section Xerocalyx was strongly supported as monophyletic; however, the current data did not show C. ramosa (microphyllous) and C. desvauxii (macrophyllous) and their respective varieties in distinct clades, suggesting that speciation events are still ongoing in these specimens.
RESUMO
Chamaecrista belongs to subtribe Cassiinae (Caesalpinioideae), and it comprises over 330 species, divided into six sections. The section Xerocalyx has been subjected to a profound taxonomic shuffling over the years. Therefore, we conducted a phylogenetic analysis using a cpDNA trnE-trnT intergenic spacer and nrDNA ITS/5.8S sequences from Cassiinae taxa, in an attempt to elucidate the relationships within this section from Chamaecrista. The tree topology was congruent between the two data sets studied in which the monophyly of the genus Chamaecrista was strongly supported. Our analyses reinforce that new sectional boundaries must be defined in the Chamaecrista genus, especially the inclusion of sections Caliciopsis and Xerocalyx in sect. Chamaecrista, considered here paraphyletic. The section Xerocalyx was strongly supported as monophyletic; however, the current data did not show C. ramosa (microphyllous) and C. desvauxii (macrophyllous) and their respective varieties in distinct clades, suggesting that speciation events are still ongoing in these specimens.
RESUMO
A propagação assexuada do "Candeeiro" Vanillosmopsis arborea Baker, espécie produtora de óleo essencial rico em alfa-bisabolol, vem sendo testada com relativo sucesso em casa de vegetação localizada na Chapada do Araripe Crato, Ceará, sua área nativa. Por outro lado, o domínio dos tratos silviculturais ainda não foi atingido. O presente trabalho, teve como finalidade repovoar quatro áreas de clareiras na Chapada do Araripe, tendo em vista a preservação de uma espécie de reconhecido valor econômico e a observação do estabelecimento de 330 mudas produzidas por estaquia. As mudas mostraram-se resistentes, com crescimento médio entre 5,99-7,18 cm, lento, porém uniforme, estando o estabelecimento definitivo a mercê das condições climáticas da região.
Vanillosmopis arborea Baker is a native tree from Chapada do Araripe located in Crato city, state of Ceará, being a potencial source of essencial oil containing á-bisabolol. Its asexual propagation has been carried out in a green house nearby Crato. This work aimed at the feasibility of growth of V. arborea Baker samples in four experimental plots in Chapada do Araripe, through the transplantation of 330 plants to the field produced by cutting. Plant growing has been observed during four months and the results showed that plants growth is suitability to climate and soil conditions, whereby an average plant growth of 5.99 - 7.18 cm was obtained.
