Abstract
The distribution pattern of calcium oxalate crystals in the leaf, stem, and root of four Nigerian species of Aneilema was investigated and reported for the first time. The histochemically localised crystals of calcium oxalate varied in shape and region of localisation depending on the vegetative part of these Aneilema species. In the leaf of these taxa, crystals were found in the basal cells of trichomes (A aequinoctiale, A. beniniense and A. umbrosum) and in the mesophyll region of the lamina. Variations in shape were apparent in the stem: rhomboidal (A. aequinoctiale and A. beniniense) and irregular (A. paludosum and A. umbrosum). The diversity in localisation and shape of calcium oxalate crystals among these investigated species of Aneilema is discussed in relation to their biological significance.
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