Opuntia macrorhiza Engelm. var. macrorhiza
Plains prickly pear, twistspine pricklypear
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5/5/2014 · American Southwest (AZ or TX) · By Jacquelyn Boyt 
5/22/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 1½ × 1′ (52 × 34 cm) 
5/22/2010 · Garden in the Woods, Framingham, Massachusetts 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| 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 | macrorhiza | With large roots or root stocks |
| var. | macrorhiza | With large roots or root stocks |
Opuntia macrorhiza var. macrorhiza description by Thomas H. Kent, not updated.
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