Abstract
In the present work the authors studied the anatomy of root, stem and leaf in Rivina humilis L.
The vascular system of petiole is collateral. The bundles throughout of petiole until apex on the lamina are generally alike.
The leaf is hypostomatic, with stomata of type paracytic, anomocytic and anisocytic. It also has neighbour and twin stomata.
The mesophyll presents dorsiventral structure. The idioblasts with prismates and styloids of calcium oxalate, are observed in root, stem and leaf.
The stem presents projections formed by collenchyma of type angular. We can observe stomata of type anomocytic and anisocytic.
The root is tetrarc in primary structure. The authors observed starch within simple fibres.