A comparative study was undertaken on the leaves and petioles of 16 species of Mallotics in order to investigate anatomical variations of potential in species identification. There is a range of characters which varies between species. These include the outline of the midrib and petiole in transverse sections, the shape of the vascular tissue in midribs, the presence of central bundles in the petiole, the presence of terminal sclereids, enlarged tracheids, presence or absence of non-glandular trichomes, and parenchymatous sheaths in vascular bundles. A combination of these characters may be used to identlfy species. Anatomical data support the placing of only a few species into the respective sections.
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