Opuntiaangustata is a poorly understood or documented prickly pear cactus reported from northwestern Arizona and adjacent portions of Nevada and California.
The photos presented here represent our concept of this Opuntia. O.angustata is larger and woodier/stiffer than O.phaeacantha but is smaller than O.engelmannii to which it seems related. Spines are often long and chalky white.
Flowers are yellow.
Ploidy is unknown.
Britton and Rose reported that the true type specimen for this Opuntia is from the bottoms of the Bill Williams River in AZ. Engelmann and Bigelow described a prickly pear cactus that had narrow cladodes. O.angustata and O.riparia are similar and may in fact represent the same taxon. O.riparia occurs further south (near Tucson, AZ and below). Also, we interpret O.angustata to be the same as O.magnarenesis described by Griffiths from Owens, AZ (near Wikieup, AZ), which does not have especially narrow cladodes.