Orservation on the morphology and the anatomy on the subterranean organ ofCARLINA ACAULISL. —The morphology and the anatomy of the subterranean organ of Carlina acaulisL.have been studied in relation to the structure of the analogous organ in Atractylis gummifera L. (Maugini, 1960). It has been shown that the two organs differ markedly: in Carlina there is an evident flattening and dissociation of the stem and a dual anatomical structure, related both to stem and to root.