This is the more common cactus on the dunes in NJ. Its flowers have no red in the center. It never has any spines. Its areoles (the dark spots) should not have much in the way of obvious spined hairs (but this is subtle) In the photo here it has little branches in the areoles but not much in the way of the hairs.
If it has red in the flowers or any spines it is probably O. caespitosa. On Long Beach Island and in Brigatine there are two weird rare (for NJ) Opuntia species.
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