Yeah, why would they be, really?
Although in all fairness you will not find many Mexicans who are not familiar with the supermarket vegetable form of the prickly pear, and its delicious but seedy fruit, at the least. A prickly pear is after all featured prominently on the national flag.
Fun trivia factoid: the genus name Nopalea is related to the Mexican Spanish word for the prickly pear and its edible stems, nopal.
But the naming of prickly pears is so not my thing. I consider it a victory to recognize our native species and the one in the supermarket.
Some more genus names for prickly pears which were formerly Opuntias.
Brasiliopuntia, Consolea, Miqueliopuntia, Nopalea, Opuntia, Tacinga, Tanilla
This is just me copying and pasting, not displaying any knowledge I will likely retain. And don't quote me on any of it.