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Laticifer systems in Mandevilla illustris and M. velutina apocynaceae
- Appezzato-Da-Gloria, Beatriz, Maranhão Estelita, Maria E.
- Acta Societatis Botanicorum Poloniae 1997 v.66 no.3-4 pp. 301-306
- Mandevilla, cambium, cerrado, savannas, Brazil
- Two Apocynaceae species from savanna (Cerrado) area of Sao Paulo State, Brazil were studied. In both Mandevilla species examined, the laticifer systems are of non-articulated branched type, characteristic of the family. In vegetative organs reported was the occurrence of a primary laticifer system of which the cells were differentiated in the embryo. However, additional laticifer cells were always produced during the growth of the shoot apex. A secondary laticiferous system produced by the cells of vascular cambium was identified in the tuberous root and in the stem. A proposed discussion on this apparently unique record in Apocynaceae was arisen to evaluate the main distinction between articulated and non-articulated laticifers.