Like so many Opuntia species, O. bentonii has been mistaken for a coastal form of O. lindheimeri in Texas, but there are sustained differences.
For instance, O. bentonii plants are often less than 60 cm in height and the fruit is more globular (less inclined to narrow at the base).
O. bentonii plants have fewer spines than O. lindheimeri, zero to 3 (often only  1 or 2).
One important difference is that the stigmas of O. bentonii flowers are yellow and not green as in O. lindheimeri.
Another individual feature of O. bentonii is that the veins are often visible between areoles.
Like so many Opuntia species, O. bentonii has been mistaken for a coastal form of O. lindheimeri in Texas, but there are sustained differences. For instance, O. bentonii plants are often less than 60 cm in height and the fruit is more globular (less inclined to narrow at the base). O. bentonii plants have fewer spines than O. lindheimeri, zero to 3 (often only  1 or 2). One important difference is that the stigmas of O. bentonii flowers are yellow and not green as in O. lindheimeri. Another individual feature of O. bentonii is that the veins are often visible between areoles.
Opuntia bentonii