Abstract
The species of the <em>Portulacaceae</em> of the Serra do Cipó, State of Minas Gerais, Brasil, were studied. In <em>Portulaca mucronata</em> and <em>P. hirsutissima</em> transfer cells are companion and phloem parenchyma cells; they have the same secondary cell wall features, that is, short papillate protuberances which are uniformly distributed around the primary cell wall. These features are similar in both species but they are very distinct from others referred in the literature; this could be useful in Taxonomy. The phloem plastids have a globular protein crystalloid, surrounded by proteinaceous filaments. In <em>P. hirsutissima</em> few starch grains may also be present, and this occurrence is considered primitive in the phylogenetic scale. These features agree with presumptive evolution of those of leaf structure: <em>P. hirsutissima</em> has C<sub>3</sub> photosynthesis structure, and <em>P. mucronata</em> C<sub>4</sub> or Kranz anatomy.
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