Abstract
Anatomy of rachis, petiole and petiolule in 43 species and 20 genera of Euphorbiaceae are investigated. The mechanical tissues in these organs are invariably sclerenchymatous and collenchymatous. The xylem elements are additionally mechanical in function. The occurrence of vascular tissues is in the form of distinct bundles, only an arc-shaped strand or a continuous cylinder. The cortical bundles are noted in Aporosa and Jatropha gossypiifolia while unequal sized central vascular bundles are observed in Mallotus nudiflorus and M. philippensis. The variation in the distribution of sclerenchyma, collenchyma and vascular patterns apart from the shapes as observed in a transverse section of the leaf stalk can be used for the delineation of the taxa studied.
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