oxypetala 2' Annular collenchyma, more than two layers of palisade parenchyma in mesophyll, more than two vascular bundles in middle vein of the blade, bicollateral bundle in petiole 3 Bicollateral bundle in blade, three vascular bundles in middle vein, six bicollateral vascular bundles in petiole N.
oxypetala, the six species have a bicollateral bundle, a characteristic cited by Sculthorpe (1967) for the petiole of this genus.
Nymphaea oxypetala stands out from the other evaluated species for having a greater number of differential characters, including angular collenchyma and the absence of bicollateral bundles in the petiole.