| Kingdom | Plantae | Plants, but not fungi, lichens, or algae |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Caryophyllidae | Cacti, many other succulents, carnivorous plants, and leadworts |
| Order | Caryophyllales | Includes cacti, carnations, amaranths, ice plants, and many carnivorous plants |
| Family | Cactaceae | Succulent (water-storing) plants, often spiny |
| Genus | Opuntia | Prickly pears |
| Species | polyacantha | With many thorns |
| var. | erinacea | Resembling a hedgehog |
Opuntia erinacea Engelm. & J.M. Bigelow ex Engelm.
Opuntia erinacea Engelm. & J.M. Bigelow ex Engelm. var. erinacea
Opuntia ursina F.A.C. Weber
Opuntia erinacea Engelm. & J.M. Bigelow ex Engelm.
Opuntia erinacea Engelm. & J.M. Bigelow ex Engelm. var. erinacea
Opuntia erinacea Engelm. & Bigelow ex Engelm.
Opuntia erinacea Engelm. & Bigelow ex Engelm. var. erinacea
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