Opuntia strigil Engelm.in Proc. Amer. Acad. Arts 3: 290. 1856 sec. Parfitt & Gibson 20031
1.Parfitt, B.D. & Gibson, A.C. 2003: Cactaceae. – In: Flora of North America Editorial Committee, Flora of North America 4. Magnoliophyta: Caryophyllidae, part 1
