| Image | Flower | Scientific name | Common Name | Distribution | Cytology [2] |
|---|
 |  | Opuntia abjecta Small ex Britton & Rose | | Florida (Keys) | 2n = 22, 2n = 44 |
 | | Opuntia aciculata Griffiths | Chenille prickly pear, old man's whiskers, cowboy's red whiskers | Texas to Mexico (Nuevo León) | 2n = 44 |
| | Opuntia altomagdalenensis Xhonneux | | Colombia | |
| | Opuntia amarilla Griffiths | | Mexico (Guanajuato to Hidalgo) | 2n = 88 |
| | Opuntia anahuacensis Griffiths | | Texas | |
|  | Opuntia arechavaletae Speg. | | S. Brazil to NE. Argentina | |
 |  | Opuntia atrispina Griffiths | | SW. Texas to Mexico (Chihuahua, Coahuila) | 2n = 22, 2n = 44 |
 | | Opuntia auberi Pfeiff. | | Mexico to Central America, Cuba. | |
 |  | Opuntia aurantiaca Lindl. | | NE. Argentina to Uruguay | 2n = 44 |
 |  | Opuntia aurea E.M.Baxter | | S. Utah to N. Arizona | 2n=66 |
| | Opuntia aureispina (S.Brack & K.D.Heil) Pinkava & B.D.Parfitt | | SW. Texas to Mexico (Coahuila) | 2n = 22 |
 | | Opuntia austrina Small | | Central Florida | |
 |  | Opuntia azurea Rose | | NE. Mexico (to Veracruz and Jalisco) | 2n = 22 |
 |  | Opuntia basilaris Engelm. & J.M.Bigelow | beavertail cactus | SW. U.S.A. to Mexico (Baja California Norte, Sonora) | 2n=22 |
 | | Opuntia bonaerensis Speg. | | Brazil (Rio Grande do Sul) to NE. Argentina | |
| | Opuntia bonplandii (Kunth) F.A.C.Weber | | Ecuador. | 2n = 88 |
| | Opuntia bravoana E.M.Baxter | | Mexico (Baja California Sur) | 2n = 66 |
| | Opuntia caboensis F.Mercado & León de la Luz | | Mexico (Baja California Sur). | |
| | Opuntia camanchica Engelm. & J.M.Bigelow | | SE. California to W. Oklahoma and W. & S. Texas | 2n = 66 |
| | Opuntia canterae Arechav. | | SW. & S. Uruguay | |
 |  | Opuntia caracassana Salm-Dyck | | S. Caribbean to Colombia | 2n = 22 |
|  | Opuntia cespitosa Raf. | | SE. Canada to E. Central & E. U.S.A. | |
|  | Opuntia chaffeyi Britton & Rose | | NE. Mexico | 2n = 44 |
| | Opuntia chiangiana Scheinvar & Manzanero | | Mexico (Oaxaca) | |
| | Opuntia chisosensis (M.S.Anthony) D.J.Ferguson | | Texas to Mexico (Coahuila) | 2n = 22 |
 |  | Opuntia chlorotica Engelm. & J.M.Bigelow | pancake prickly pear | native to southwest USA and the Sonoran and Mojave deserts | 2n=22 |
| | Opuntia clarkiorum Rebman | | Mexico (Baja California Norte) | |
 |  | Opuntia cochenillifera (L.) Mill. | | Mexico. | |
| | Opuntia crassa Haw. | | Mexico (México State to Guanajuato). | 2n = 88 |
| | Opuntia crystalenia Griffiths | | Mexico (Tabasco) | |
 | | Opuntia cubensis Britton & Rose | | Cuba | 2n = 44 |
| | Opuntia curassavica (L.) Mill. | | Caribbean to N. Venezuela | |
| | Opuntia curvispina Griffiths | | S. Nevada to SE. California and W. & N. Arizona. | 2n = 44 |
| | Opuntia deamii Rose | | Mexico (Chiapas) to Honduras | |
 | | Opuntia decumbens Salm-Dyck | | El Salvador, Guatemala, Honduras, Mexico Central, Mexico, Nicaragua, Panamá | |
 |  | Opuntia dejecta Salm-Dyck | | Mexico to Nicaragua, Cuba | |
| | Opuntia delafuentiana Martínez-Gonz., Luna-Vega, Gallegos & García-Sand. | | Mexico (Hidalgo) | |
 | | Opuntia depressa Rose | | SW. & Central Mexico (to Veracruz) | |
 | | Opuntia diploursina Stock, N.Hussey & Beckstrom | | Grand Canyon and Lake Mead National Recreation Area | 2n=22 |
| | Opuntia discolor Britton & Rose | | Bolivia to N. Argentina | |
 | | Opuntia drummondii Graham | | Alabama, Florida, Georgia, Mississippi, North Carolina, South Carolina, Texas | |
 | | Opuntia dulcis Engelm. | | New Mexico to W. Texas. | 2n = 66 |
| | Opuntia eichlamii Rose | | Mexico (Chiapas) to Guatemala | 2n = 66 |
 |  | Opuntia elata Link & Otto ex Salm-Dyck | | S. Bolivia to Brazil (Rio Grande do Sul) and N. to Argentina | 2n = 22, 2n = 44 |
| | Opuntia elatior Mill. | | S. Caribbean, Costa Rica to Venezuela | 2n = 22, 2n = 66 |
| | Opuntia elizondoana E.Sánchez & Villaseñor | | Mexico (Guanajuato to San Luis Potosí). | 2n = 44 |
 |  | Opuntia engelmannii Salm-Dyck ex Engelm. | Engelmann's prickly pear, cow's-tongue prickly pear, desert prickly pear, discus prickly pear, Texas prickly pear, calico cactu | Arizona, California, Louisiana, Nevada, New Mexico, Texas, Utah, Mexico | 2n=66 |
 |  | Opuntia erinacea Engelm. & J.M.Bigelow | | California, Nevada, Arizona, Utah and N. Mexico | |
| | Opuntia escuintlensis (Matuda) Lodé | | Mexico (Chiapas) | |
| | Opuntia excelsa Sánchez-Mej. | | Mexico (to Sinaloa) | 2n = 22 |
| | Opuntia feroacantha Britton & Rose | | Mexico (Sinaloa to Michoacán) | |
 |  | Opuntia ficus-indica (L.) Mill. | Indian fig opuntia | Mexico (Oaxaca) | 2n = 22 |
 |  | Opuntia fragilis (Nutt.) Haw. | little prickly pear, brittle cactus | the Great Plains, parts of the Midwest and in several Canadian provinces, up to 56°N | 2n = 66 |
 | | Opuntia fuliginosa Griffiths | | Mexico | 2n = 88 |
 |  | Opuntia galapageia Hensl. | Galápagos prickly pear | Galápagos Islands | 2n = 66 |
| | Opuntia gallegiana Scheinvar & Olalde | | Mexico (Zacatecas). | |
 |  | Opuntia gosseliniana F.A.C.Weber | violet prickly pear | Arizona to Mexico (Sonora) | 2n = 22 |
 | | Opuntia guatemalensis Britton & Rose | | Costa Rica, El Salvador, Guatemala, Honduras, Mexico (Veracruz, Oaxaca), Nicaragua | |
| | Opuntia guilanchi Griffiths | | Mexico | |
| | Opuntia hitchcockii J.G.Ortega | | Mexico (Sinaloa, Nayarit) | |
| | Opuntia hondurensis Standl. | | Honduras | |
|  | Opuntia howeyi J.A.Purpus | | Mexico (Zacatecas) | |
 | | Opuntia huajuapensis Bravo | | Mexico (Veracruz, Puebla, Oaxaca) | |
 |  | Opuntia humifusa (Raf.) Raf. | eastern prickly pear | humid regions of Eastern United States and northerly regions into Canada, Mexico (Tamaulipas, San Luis Potosí) | n = 22, 2n=44 |
 |  | Opuntia hyptiacantha F.A.C.Weber | | Mexico. | 2n = 66 |
| | Opuntia inaequilateralis A.Berger | | Peru. | 2n = 66 |
 | | Opuntia inaperta (Schott ex Griffiths) D.R.Hunt | | SE. Mexico (to Veracruz) | |
| | Opuntia jaliscana Bravo | | Mexico | |
| | Opuntia jamaicensis Britton & Harris | | Jamaica | 2n = 22 |
| | Opuntia kingstoniana Guiggi | | Jamaica. | |
| | Opuntia lagunae E.M.Baxter | | Mexico (Baja California Sur) | |
 |  | Opuntia lasiacantha Pfeiff. | | Mexico | 2n = 88 |
 |  | Opuntia leucotricha DC. | arborescent prickly pear, Aaron's beard cactus, semaphore cactus, Duraznillo blanco, nopal blanco | N. & W. Mexico | 2n = 44 |
 |  | Opuntia littoralis (Engelm.) Cockerell | coastal prickly pear, sprawling prickly pear | California to Mexico (Baja California Norte) | 2n = 66 |
| | Opuntia lutea (Rose) D.R.Hunt | | Mexico (Oaxaca, Chiapas), Costa Rica, Guatemala, Honduras, Nicaragua | |
| | Opuntia mackensenii Rose | | Texas | 2n = 44 |
 |  | Opuntia macrocentra Engelm. | black-spined prickly pear, purple prickly pear | southwest USA and northern Mexico | 2n = 22 |
 |  | Opuntia macrorhiza Engelm. | Plains prickly pear | Great Plains except for the northernmost areas (not found in North Dakota), and extending sporadically eastward as far as Kentucky | 2n = 22, 2n=44 |
| | Opuntia mantaroensis Guiggi | | Peru | |
| | Opuntia martiniana (L.D.Benson) B.D.Parfitt | | Arizona | |
| | Opuntia matudae Scheinvar | xoconostle | Mexico | 2n = 66 |
| | Opuntia maxima Mill. | | Central & SW. Mexico | |
 | | Opuntia megacantha Salm-Dyck | | Mexico (to Jalisco) | 2n = 66 |
| | Opuntia megapotamica Arechav. | | Argentina, Brazil , Uruguay | |
| | Opuntia megarrhiza Rose | | Mexico (Tamaulipas, San Luis Potosí) | 2n = 66 |
| | Opuntia mesacantha Raf. | | United States (Alabama, Florida, Georgia, Louisiana, Maryland, Mississippi, New Jersey, North Carolina, South Carolina, Tennessee, Virginia) | |
 |  | Opuntia microdasys (Lehm.) Pfeiff. | bunny ears cactus, polka-dot cactus | Mexico | 2n = 22 |
 | | Opuntia militaris Britton & Rose | | Cuba | |
 |  | Opuntia monacanthos (Willd.) Haw. | common prickly pear | Brazil, Paraguay, Uruguay | |
|  | Opuntia nemoralis Griffiths | | United States (Arkansas, Louisiana, Missouri, Texas) | |
| | Opuntia nicholii L.D.Benson | | United States (Arizona, Nevada, Utah ) | |
| | Opuntia ochrocentra Small ex Britton & Rose | | Florida (Big Pine Key) | 2n = 55 |
 | | Opuntia orbiculata Salm-Dyck ex Pfeiff. | | United States (Arizona, Nevada, New Mexico, Oklahoma, Texas), Mexico | 2n = 22, 2n = 44 |
 |  | Opuntia oricola Philbrick | | California to Mexico (Baja California Norte) | 2n = 33, 2n = 66 |
| | Opuntia pachyrrhiza H.M.Hern., Gómez-Hin. & Bárcenas | | Mexico (Nuevo León, Querétaro, San Luis Potosí) | 2n = 22 |
| | Opuntia parviclada S.Arias & Gama | | Mexico (Puebla, Oaxaca) | |
| | Opuntia peckii J.A.Purpus | | Mexico | |
| | Opuntia perotensis Scheinvar, Olalde & Gallegos | | Mexico (Veracruz) | |
 |  | Opuntia phaeacantha Engelm. | tulip prickly pear, includes plateau prickly pear, brown-spined prickly pear, Mojave prickly pear, Kingman prickly pear | United States (Arizona, California, Colorado, Kansas, Nevada, New Mexico, Oklahoma, Texas, Utah), Mexico | 2n=66 |
 | | Opuntia pilifera F.A.C.Weber | | Central Mexico (to Oaxaca) | 2n = 88 |
 |  | Opuntia pinkavae B.D.Parfitt | Pinkava prickly pear | SW. Utah to NW. Arizona | 2n=88 |
| | Opuntia pittieri Britton & Rose | | Colombia | |
 |  | Opuntia polyacantha Haw. | Plains prickly pear, Starvation Prickly pear, Panhandle prickly pear | the Great Plains, Great Basin, Mojave Desert, Colorado Plateau, and the Rocky Mountains | 2n=22, 2n=44 |
 |  | Opuntia pottsii Salm-Dyck | | SE. Arizona to W. Texas and NE. Mexico | 2n = 44 , 2n = 66 |
| | Opuntia preciadoae Scheinvar, Olalde, Gallegos & J.Morales S. | | N. Mexico | |
| | Opuntia puberula Pfeiff. | | Mexico to Guatemala | 2n = 66 |
 | | Opuntia pubescens H.L.Wendl. ex Pfeiff. | | Mexico to Venezuela and Paraguay | 2n = 44 |
 | | Opuntia pycnantha Engelm. | | Mexico (Baja California Sur) | |
 |  | Opuntia quimilo K.Schum. | | Argentina, Bolivia, Paraguay | 2n = 22 |
 |  | Opuntia quitensis F.A.C.Weber | Red Buttons opuntia | Colombia, Ecuador, Peru | 2n=22, 2n =44 |
 | | Opuntia rastrera F.A.C.Weber | | Mexico (to Veracruz and Jalisco) | 2n = 66 |
 |  | Opuntia repens Bello | | Hispaniola to Virgin Islands | 2n = 22, 2n = 44 |
| | Opuntia retrorsa Speg. | | Argentina, Bolivia, Brazil, Paraguay, Uruguay | |
| | Opuntia ritteri A.Berger | | Mexico (Zacatecas) | |
| | Opuntia robinsonii J.G.Ortega | | N. & W. Mexico | |
 |  | Opuntia robusta H.L.Wendl. ex Pfeiff. | | Mexico | 2n = 22, 2n = 44 |
 |  | Opuntia rufida Engelm. | | SW. Texas to NE. Mexico | 2n = 22 |
| | Opuntia rzedowskii Scheinvar | | Mexico (México D.F.) | 2n = 88 |
| | Opuntia sanguinea Proctor | | Jamaica | 2n = 22 |
 | | Opuntia scheeri F.A.C.Weber | | NE. Mexico (to Jalisco) | 2n = 22 |
| | Opuntia schumannii F.A.C.Weber ex A.Berger | | Colombia, Venezuela | |
| | Opuntia setocarpa Arreola-Nava, Guzm.-Hern. & Cuevas | | Mexico (Jalisco) | |
| | Opuntia sierralagunensis León de la Luz & F.Mercado | | Mexico (Baja California Sur). | |
 | | Opuntia soederstromiana Britton & Rose | | Colombia, Ecuador | 2n = 88 |
 |  | Opuntia spinosibacca M.S.Anthony | | SW. Texas to Mexico (Coahuila) | |
 | | Opuntia spinulifera Salm-Dyck | | E. & Central Mexico | |
| | Opuntia stenarthra K.Schum. | | E. Bolivia to Central Paraguay and NE. Argentina | |
 |  | Opuntia stenopetala Engelm. | | NE. Mexico (to Veracruz) | |
 |  | Opuntia streptacantha Lem. | | Mexico to Guatemala | |
 |  | Opuntia stricta (Haw.) Haw. | erect prickly pear, spineless prickly pear | SE. U.S.A. to E. & S. Mexico | 2n = 66 |
| | Opuntia strigil Engelm. | | W. Texas to NE. Mexico | 2n = 22, 2n = 44 |
 |  | Opuntia sulphurea G.Don ex Salm-Dyck | | Bolivia to Uruguay. | 2n = 22 |
| | Opuntia tapona Engelm. ex J.M.Coult. | | Mexico (Baja California Sur) | |
| | Opuntia tehuacana S.Arias & U.Guzmán | | Mexico (Puebla, Oaxaca) | |
| | Opuntia tehuantepecana (Bravo) Bravo | | Mexico (Oaxaca, Chiapas). | |
| | Opuntia tezontepecana Gallegos & Scheinvar | | Mexico (Hidalgo) | |
 |  | Opuntia tomentosa Salm-Dyck | | Mexico to Honduras | |
|  | Opuntia tortispina Engelm. & J.M.Bigelow | | United States (Colorado, Kansas, Nebraska, New Mexico, Oklahoma, Texas, Wyoming ) | 2n = 44 |
| | Opuntia triacanthos (Willd.) Sweet | | Puerto Rico to Lesser Antilles. | |
 |  | Opuntia tuna (L.) Mill. | | Mexico, S. Jamaica | 2n = 44 |
| | Opuntia tunoidea Gibbes | | Coastal South Carolina | |
 | | Opuntia velutina F.A.C.Weber | | Mexico. | |
| | Opuntia wilcoxii Britton & Rose | | Mexico | |
| | Opuntia zacuapanensis A.Berger | | Mexico (Veracruz) | |
| | Opuntia zamudioi Scheinvar | | Mexico (Querétaro, San Luis Potosí) | 2n = 88 |
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