These micrographs show details of the anomalous growth which occurs in Bougainvillea (Nyctaginaceae). Note the included vascular bundles (white ovoids), embedded within the secondary xylem (2X).

see Carlquist, S. 2004: Lateral meristems, successive cambia and their products: a reinterpretation based on roots and stems of Nyctaginaceae. Bot. J. Linn. Soc.146: (2) 129-143.

Detail, showing several included vascular bundles. The vascular cambia produce vessels, axial parenchyma and sometimes fibres to the inside and indefinite amounts of secondary phloem to the outside in these included bundles.

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