Cacus flowers are large and showy in many genera, with dozens of petals and stamens rather than just the 5 or 10 of each as one might expect of a dicot. All cacti, other than a few species in Pereskia, have an inferior ovary, but not merely inferior, they are spectacularly, superiorly inferior!
When you look at a cactus flower bud, you are not seeing any flower tissue at all except for the sepals and petals at the very tip; all the rest is vegetative stem and leaf, and the true flower parts are located inside. It is easier to comprehend that this really is vegetative tissue by realizing that these leaves typically bear clusters of spines in their axils.
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