Anatomia do lenho de espécies de Euphorbiaceae nativas e cultivadas no Rio Grande do Sul

Abstract

The family Euphorbiaceae sensu lato is distributed specially in the tropics, in various types of vegetation and habitats, being one of the largest, most complex and diverse Angiosperm families. Recently, it was divided in four botanical families: Euphorbiaceae sensu stricto, Phyllanthaceae, Picrodendraceae and Putranjivaceae. The present study aims to provide important information about the anatomical characters of taxonomic, ecological and phylogenetic value to the species and genera involved, as well as recognize the affinity of anatomical groups, comparing the result to anatomical literature of Rio Grande do Sul state, increasing the list of described species. To obtain cutting blades and macerate, respectively was used in the standard technique (BURGER; RICHTER, 1991) and the method of Franklin modified (KRAUS; ARDUIN, 1997). The wood samples are from Departamento de Ciências Florestais (UFSM). The descriptions of the seven species followed the IAWA Committee (1989). Cluster analysis on the species described in the present study over nine other species of Euphorbiaceae and Phyllanthaceae, occurring naturally in the Rio Grande do Sul state, described in the literature were used. This analysis was performed in order to collate and compare the species. Two major groups were recognized, the first one, represented by Hieronyma alchorneoides, and the other species investigated, the species most similar to each other were the Croton dracunculoides and Croton pycnocephalus and Euphorbia tirucalli and Euphorbia cotinifolia, the genus Sebastiania were very heterogeneous because groups together not formed.